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/browser-fingerprint.html

@@ -12,7 +12,7 @@
 </a>
 </p>
 
-<p>You need to find what <strong>most browsers</strong> are reporting, and then use those variables to bring your browser in the same population. This means having the same fonts, plugins, and extensions installed as the large installed base. You should have a <a href="https://addons.mozilla.org/firefox/addon/uaswitcher/">spoofed user agent string</a> to match what the large userbase has. You need to have the same settings enabled and disabled, such as DNT and WebGL. You need your browser to look as common as everyone else. Disabling JavaScript, using Linux, or even the TBB, will make your browser stick out from the masses.</p>
+<p>You need to find what <strong>most browsers</strong> are reporting, and then use those variables to bring your browser in the same population. This means having the same fonts, plugins, and extensions installed as the large installed base. You should have a <a href="https://addons.mozilla.org/firefox/addon/uaswitcher/">spoofed user-agent string</a> to match what the large userbase has. You need to have the same settings enabled and disabled, such as DNT and WebGL. You need your browser to look as common as everyone else. Disabling JavaScript, using Linux, or even using the Tor Browser Bundle, will make your browser stick out from the masses.</p>
 
 <p>Modern web browsers have not been architected to assure personal web privacy. Rather than worrying about being fingerprinted, it seems more practical to use <a href="#addons"><i class="fas fa-link"></i> free software plugins</a> like Privacy Badger and uBlock Origin. They not only respect your freedom, but your privacy also. You can get much further with these than trying to manipulate your browser's fingerprint.</p>
 
@@ -27,5 +27,5 @@
 <ul>
   <li><a href="https://panopticlick.eff.org/static/browser-uniqueness.pdf">How Unique Is Your Web Browser? Peter Eckersley, EFF.</a></li>
   <li><a href="#addons"><i class="fas fa-link"></i> Our Firefox privacy add-ons section.</a></li>
-  <li><a href="https://www.browserleaks.com/">BrowserLeaks.com</a> - Web browser security testing tools, that tell you what exactly personal identity data may be leaked without any permissions when you surf the Internet.</li>
+  <li><a href="https://www.browserleaks.com/">BrowserLeaks.com</a> - Web browser security testing tools that tell you what exactly personal identity data may be leaked without any permissions when you surf the Internet.</li>
 </ul>