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/key-disclosure-law.html

@@ -69,7 +69,7 @@
 
 <img src="/assets/img/layout/USA.png" width="200" height="200" class="img-fluid float-right ml-3" alt="USA">
 
-<p>Services based in the United States are not recommended because of the country's surveillance programs, use of <a href="https://www.eff.org/issues/national-security-letters/faq">National Security Letters</a> (NSLs) and accompanying gag orders, which forbid the recipient from talking about the request. This combination allows the government to <a href="https://www.schneier.com/blog/archives/2013/08/more_on_the_nsa.html">secretly force</a> companies to grant complete access to customer data and transform the service into a tool of mass surveillance.</p>
+<p>Services based in the United States are not recommended because of the country's surveillance programs and use of <a href="https://www.eff.org/issues/national-security-letters/faq">National Security Letters</a> (NSLs) with accompanying gag orders, which forbid the recipient from talking about the request. This combination allows the government to <a href="https://www.schneier.com/blog/archives/2013/08/more_on_the_nsa.html">secretly force</a> companies to grant complete access to customer data and transform the service into a tool of mass surveillance.</p>
 
 <p>An example of this is <a href="https://en.wikipedia.org/wiki/Lavabit#Suspension_and_gag_order">Lavabit</a> – a secure email service created by Ladar Levison. The FBI <a href="https://www.vice.com/en_us/article/nzz888/lavabit-founder-ladar-levison-discusses-his-federal-battle-for-privacy">requested</a> Snowden's records after finding out that he used the service. Since Lavabit did not keep logs and email content was stored encrypted, the FBI served a subpoena (with a gag order) for the service's SSL keys. Having the SSL keys would allow them to access
 communications (both metadata and unencrypted content) in real time for all of Lavabit's customers, not just Snowden's.</p>