Clean up browser extensions

[freddy-m]

Checklist
I have read the guidelines in CONTRIBUTING.md	yes
Include my name in CONTRIBUTORS.md	yes
I am affiliated with this alternative (if applicable)	no

Details

Removes a large portion of the browser extension section. From Privacy Guides (full disclosure: I'm a team member):

In general, we recommend keeping your browser extensions to a minimum to decrease your attack surface; they have privileged access within your browser, require you to trust the developer, can make you stand out, and weaken site isolation. However, uBlock Origin may prove useful if you value content blocking functionality.

Closes: #459, #460, #461, #462, #463, #464, #465, #466, #467, #482

If @tycrek is happy it would be great to remove even more of these extensions, but this PR is mainly focused on those with issues open RN.

[tycrek]

Thank you!

[tycrek]

Also, if you're interested, see #502

[tycrek]

I really fkd that up um. @freddy-m can you please re-do this PR but without touching the README.md file? It's automatically generated by the build script. Use this instead: https://github.com/tycrek/degoogle/blob/master/yaml/browserExtensions.yml