Fix some typos, grammar, etc., and add details (#1418)

* Fix some typos, grammar, etc. on the site

Fixes some issues with typos, capitalization, grammar, and et cetera.

* Fix typo, grammar, etc. in repository

* Update README.md
Mention Discourse community earlier, add missing period

* Update CONTRIBUTING.md
i.e. is used for equivalence or clarification while e.g. is for
examples. For instance, we shouldn't say that IMAP is equivalent or an
explanation to all open-source software used to access email (e.g.
there's POP3, open-source clients to access when there isn't IMAP such
as Tutanota, etc.).

We also shouldn't call IMAP open-source software since it's a protocol.

* Change "socially motivated

* Apply suggestions from code review

Co-Authored-By: Jonah Aragon <jonah@triplebit.net>

* Suggestion from code review with extras

* 'Kill switch' to 'Killswitch"

* Consistency and minor additions to details

- More parallel sentence structures, following <Name> <Verb phrase>
for the first sentence of cards. Related to issue #1420.
- Make Njalla parallel to the others, and mention Njalla
is based in Nevis with VPS in Sweden
- Don't use "us" when talking about external services
- Orange Website also provides domain registration
- Update capitalization and add more hyphens
- Mention that TOS;DR evaluations are done by the community and that
  they also evaluate privacy policies (see https://edit.tosdr.org/about)
- "E2EE encryption" is redundant since "E2EE" already has "encryption"
in it. Might as well expand it since full term is used later on.
- <Name> <Verb phrase> structure for Magic Wormhole
- For consistency, don't start Worth Mentioning entries with the name
- https://english.stackexchange.com/questions/27707/post-hyphenation-of-split-compound-words
- All the other "alert alert-warning" don't repeat the generic name and 
we also don't say 'a software'

* instant-messenger: Remove <em>, more cleanup

* voice-video-messenger: Hyphens and cleanup

- We don't say "a software" so replace it with something that works

* paste-services: Cleanup & change cryptography info

As per CryptPad's whitepaper and FAQ:
https://cryptpad.fr/faq.html#security-crypto
https://blog.cryptpad.fr/images/CryptPad-Whitepaper-v1.0.pdf

Fixes #1417.

* encryption: "open-source"

* Page descriptions and other cleanup

_includes/sections/vpn.html

@@ -12,11 +12,11 @@
     </div>
     <div class="col">
     <h2>Mullvad <span class="badge badge-info">EUR €60/Year</span></h2>
-    <p><strong>Mullvad</strong> is a fast and inexpensive VPN with a serious focus on transparency and security, they have been in operation since <strong>2009</strong>. It is the only VPN provider that currently meets our criteria for recommendation. Mullvad is based in <span class="flag-icon flag-icon-se"></span> Sweden and does not have a free trial. Visit <a href="https://mullvad.net/">mullvad.net</a> to create an account.</p>
+    <p><strong>Mullvad</strong> is a fast and inexpensive VPN with a serious focus on transparency and security. They have been in operation since <strong>2009</strong>. It is the only VPN provider that currently meets our criteria for recommendation. Mullvad is based in <span class="flag-icon flag-icon-se"></span> Sweden and does not have a free trial. Visit <a href="https://mullvad.net/">mullvad.net</a> to create an account.</p>
     <h5><span class="badge badge-success">409+ Servers</span></h5>
     <p>Mullvad has 409 servers in 38 countries at the time of writing this page. Typically the more servers a provider offers, the better: With hundreds of servers in operation, you are far more likely to find a fast connection and a server geographically closest to you.</p>
     <h5><span class="badge badge-success">WireGuard Support</span></h5>
-    <p>In addition to standard OpenVPN connections, Mullvad supports Wireguard. Wireguard is an experimental protocol with theoretically better security and higher reliability, although it is not currently recommended for production use.</p>
+    <p>In addition to standard OpenVPN connections, Mullvad supports WireGuard. WireGuard is an experimental protocol with theoretically better security and higher reliability, although it is not currently recommended for production use.</p>
     <h5><span class="badge badge-success">Independently Audited</span></h5>
     <p>Mullvad's VPN clients have been audited by Cure53 and Assured AB in a pentest report <a href="https://cure53.de/pentest-report_mullvad_v2.pdf">published at cure53.de</a>. The security researchers concluded:</p>
     <blockquote class="blockquote">
@@ -58,7 +58,7 @@
     <h5><span class="badge badge-success">442+ Servers</span></h5>
     <p>ProtonVPN has 442 servers in 33 countries at the time of writing this page. Typically the more servers a provider offers, the better: With hundreds of servers in operation, you are far more likely to find a fast connection and a server geographically closest to you.</p>
     <h5><span class="badge badge-success">Accepts Bitcoin</span></h5>
-    <p>ProtonVPN does technically accept Bitcoin payments, however you either need to have an existing account, or contact their support team in advance to register with Bitcoin.</p>
+    <p>ProtonVPN does technically accept Bitcoin payments; however, you either need to have an existing account, or contact their support team in advance to register with Bitcoin.</p>
     <h5><span class="badge badge-success">Mobile Clients</span></h5>
     <p>In addition to providing standard OpenVPN configuration files, ProtonVPN has mobile clients for iOS or Android allowing for easy connections to their servers.</p>
     <h5><span class="badge badge-info">Extra Functionality</span></h5>
@@ -72,7 +72,7 @@
     </div>
     <div class="col">
     <h2>IVPN <span class="badge badge-info">USD $100/Year</span></h2>
-    <p><strong>IVPN</strong> is another strong premium VPN provider, and they have been in operation since <strong>2009</strong>. IVPN is based in <span class="flag-icon flag-icon-gi"></span> Gibraltar and offers a 3 day free trial. Unfortunately due to its lack of an independent security audit it does not meet the complete criteria for recommendation, see our notes below.</p>
+    <p><strong>IVPN</strong> is another strong premium VPN provider, and they have been in operation since <strong>2009</strong>. IVPN is based in <span class="flag-icon flag-icon-gi"></span> Gibraltar and offers a 3 day free trial. Unfortunately, due to its lack of an independent security audit, it does not meet the complete criteria for recommendation, see our notes below.</p>
     <h5><span class="badge badge-danger">No Security Audit</span></h5>
     <p>IVPN has undergone a <a href="https://cure53.de/audit-report_ivpn.pdf">no-logging audit from Cure53</a> which concluded in agreement with IVPN's no-logging claim. However, IVPN has not undergone a more comprehensive security audit by an independent third party, and therefore cannot be strongly recommended at this time. We have still chosen to list it on this page with the assumption that an audit will be published soon: The IVPN team <a href="https://twitter.com/yaelwrites/status/1161796418220089344">reportedly plans to begin the process in September</a>.</p>
     <p>We will reevaluate this listing at the end of 2019 or when the aforementioned report has been published, whichever is sooner.