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/productivity-tools.html

@@ -4,7 +4,7 @@
   include cardv2.html
   title="CryptPad"
   image="/assets/img/provider/CryptPad.png"
-  description="<strong>CryptPad</strong> is a private-by-design alternative to popular office tools and cloud services. All content is end-to-end encrypted. It is free and open source, enabling anyone to verify its security by auditing the code. The development team is supported by donations and grants. No registration is required, and it can be used anonymously via Tor Browser."
+  description="<strong>CryptPad</strong> is a private-by-design alternative to popular office tools and cloud services. All content is end-to-end encrypted. It is free and open-source, enabling anyone to verify its security by auditing the code. The development team is supported by donations and grants. No registration is required, and it can be used anonymously via Tor Browser."
   website="https://cryptpad.fr/"
   forum="https://forum.privacytools.io/t/discussion-cryptpad-productivity-tools/1537"
   github="https://github.com/xwiki-labs/cryptpad"
@@ -16,7 +16,7 @@
   title="Etherpad"
   image="/assets/img/tools/Etherpad.png"
   image-dark="/assets/img/tools/Etherpad-dark.png"
-  description="<strong>Etherpad</strong> is a highly customizable open source online editor providing collaborative editing in real-time. <a href=https://github.com/ether/etherpad-lite/wiki/Sites-that-run-Etherpad>Here are a list of sites that run Etherpad</a>."
+  description="<strong>Etherpad</strong> is a highly customizable open-source online editor providing collaborative editing in real time. <a href=https://github.com/ether/etherpad-lite/wiki/Sites-that-run-Etherpad>Here are a list of sites that run Etherpad</a>."
   website="https://etherpad.org/"
   forum="https://forum.privacytools.io/t/discussion-etherpad-productivity-tools/1538"
   github="https://github.com/ether/etherpad-lite"
@@ -54,9 +54,9 @@
   <li><a href="https://crypt.ee/">Cryptee</a> - Free privacy-friendly service for storing Documents, files and Photos</li>
   <li><a href="https://ethercalc.net/">EtherCalc</a> - EtherCalc is a web spreadsheet. Data is saved on the web, and people can edit the same document at the same time. Changes are instantly reflected on all screens. Work together on inventories, survey forms, list management, brainstorming sessions.</li>
   <li><a href="https://disroot.org/">Disroot</a> - Free privacy-friendly service that offers Etherpad, EtherCalc and PrivateBin.</li>
-  <li><a href="https://dudle.inf.tu-dresden.de/anonymous/">dudle</a> - An online scheduling application, free and open source. Schedule meetings or make small online polls. No email collection or the need of registration.</li>
-  <li><a href="https://framadate.org/">Framadate</a> - A free and open source online service for planning an appointment or making a decision quickly and easily. No registration is required.</li>
-  <li><a href="https://www.libreoffice.org/">LibreOffice</a> - Free and open source office suite.</li>
+  <li><a href="https://dudle.inf.tu-dresden.de/anonymous/">dudle</a> - An online scheduling application, free and open-source. Schedule meetings or make small online polls. No email collection or the need of registration.</li>
+  <li><a href="https://framadate.org/">Framadate</a> - A free and open-source online service for planning an appointment or making a decision quickly and easily. No registration is required.</li>
+  <li><a href="https://www.libreoffice.org/">LibreOffice</a> - Free and open-source office suite.</li>
   <li><a href="https://vscodium.com/">VSCodium</a> - Fork of Microsoft's Visual Studio Code editor without branding or telemetry.</li>
 </ul>