Remove I2P and Freenet

[jonaharagon]

After discussing this on Matrix, there is really no clear benefit to these networks over Tor. It makes more sense to promote Tor usage rather than highlight alternative self-contained networks. This PR...

• Removes the Self-Contained Networks Page
• Renames "Browsers" to "Internet Browsing"
• Creates new dedicated "Tor" page under "Internet Browsing"
• Moves Tor Browser from Desktop and Mobile Browsers pages to Tor page
• Moves Snowflake from Desktop Browsers to Tor page
• Moves Orbot from Self-Contained Networks to Tor page
• Changes "Onion" tooltip on Onion Services links to "Onion Services" for all recommendation cards site-wide
• Changes "Tor Project" icon to "Tor Browser" icon for all Onion Services links site-wide (looks nicer)

Also: https://github.com/privacyguides/team/discussions/5#discussioncomment-3377771

[github-actions]

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[jonaharagon]

We should look into adding more software besides just Snowflake in the "Relays and Bridges" section, and we should potentially consider a third "Hidden Services" section recommending software on the server side of things, but both of these can be saved for a future PR.