Add Frontends Page

[matchboxbananasynergy]

This PR moves FreeTube, NewPipe, Invidious, Piped, and Librarian to a new "Frontends" page so that we can expand it with non-video streaming frontends in the future.

Discussion on the topic: https://github.com/privacyguides/privacyguides.org/discussions/1791

[github-actions]

🎊 PR Preview 94fe39b has been successfully built and deployed to https://privacyguides-privacyguides-org-preview-pr-1792.surge.sh

🕐 Build time: 104.733s

_{🤖 By surge-preview}

[jonaharagon]

from matrix:

with the frontends PR I want to have a paragraph or two at the top of the page explaining what they actually are and why/when they're useful
would you rather add that before merging or merge this and add that in a future PR?

[matchboxbananasynergy]

from matrix:

with the frontends PR I want to have a paragraph or two at the top of the page explaining what they actually are and why/when they're useful
would you rather add that before merging or merge this and add that in a future PR?

As discussed in Matrix, this will be handled in a new PR

[matchboxbananasynergy]

from matrix:

with the frontends PR I want to have a paragraph or two at the top of the page explaining what they actually are and why/when they're useful
would you rather add that before merging or merge this and add that in a future PR?

As discussed in Matrix, this will be handled in a new PR

[privacyguides-bot]

This pull request has been mentioned on Privacy Guides. There might be relevant details there:

https://discuss.privacyguides.net/t/v2-25/18/1