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/password-managers.html

@@ -8,7 +8,7 @@
   include cardv2.html
   title="Bitwarden - Cloud/Self-host"
   image="/assets/img/tools/bitwarden.png"
-  description="<strong>Bitwarden</strong> is a free and open source password manager. It aims to solve password management problems for individuals, teams, and business organizations. Bitwarden is among the easiest and safest solutions to store all of your logins and passwords while conveniently keeping them synced between all of your devices. If you don't want to use the Bitwarden cloud, you can easily host your own Bitwarden server."
+  description="<strong>Bitwarden</strong> is a free and open-source password manager. It aims to solve password management problems for individuals, teams, and business organizations. Bitwarden is among the easiest and safest solutions to store all of your logins and passwords while conveniently keeping them synced between all of your devices. If you don't want to use the Bitwarden cloud, you can easily host your own Bitwarden server."
   website="https://bitwarden.com/"
   forum="https://forum.privacytools.io/t/discussion-bitwarden/1343"
   github="https://github.com/bitwarden"
@@ -53,7 +53,7 @@
   include cardv2.html
   title="LessPass - Browser"
   image="/assets/img/tools/LessPass.png"
-  description="<strong>LessPass</strong> is a free and open source password manager that generates unique passwords for websites, email accounts, or anything else based on a master password and information you know. No sync needed. Uses PBKDF2 and SHA-256. It's advised to use the browser addons for more security."
+  description="<strong>LessPass</strong> is a free and open-source password manager that generates unique passwords for websites, email accounts, or anything else based on a master password and information you know. No sync needed. Uses PBKDF2 and SHA-256. It's advised to use the browser addons for more security."
   website="https://lesspass.com/"
   forum="https://forum.privacytools.io/t/discussion-keepassxc/1344/2"
   github="https://github.com/lesspass/lesspass"
@@ -71,7 +71,7 @@
 
 <ul>
   <li>
-    <a href="https://masterpassword.app">Master Password</a> - Master Password is based on an ingenious password generation algorithm that guarantees your passwords can never be lost. Its passwords aren't stored: they are generated on-demand from your name, the site, and your master password. No syncing, backups, or internet access needed.
+    <a href="https://masterpassword.app">Master Password</a> - A password manager based on an ingenious password-generation algorithm that guarantees your passwords can never be lost. Its passwords aren't stored: they are generated on-demand from your name, the site, and your master password. No syncing, backups, or internet access needed.
   </li>
 
   <li>