Remove our predefined bookmarks

Originally created by @sajolida on #15895 (Redmine)

I see in Tails 3.9 the following bookmarks embedded in Tails:

• https://tails.boum.org/
• file:///usr/share/doc/tails/website/index.en.html
• https://webmail.no-log.org/
• https://mail.riseup.net/
• https://webmail.boum.org/
• https://check.torproject.org/
• https://www.torproject.org/
• https://tor.stackexchange.com/

Now that we have good support for bookmarks in Persistence, I think we should review this list.

• I don’t think it should be a place to link the email providers our team historically liked the most.
• I don’t think that the Tor stack exchange is an official support channel anymore.

We’d be left with:

• https://tails.boum.org/
• file:///usr/share/doc/tails/website/index.en.html
• https://check.torproject.org/
• https://www.torproject.org/

Going a bit futher:

• Searching for “Tails” or “Tor Project” in the URL bar points you to https://tails.boum.org/ and https://www.torproject.org/. I think that’s what the majority of our users will do instead of looking for it in the bookmark menu.
• Our documentation is already linked from the desktop and the Applications menu.

So if we want, I don’t think we would miss much by getting rid of this file completely. It’s a SQL dump that seems painful to maintain, so that might be a good move.

Feature Branch: feature/15895-remove-custom-bookmarks+force-all-tests

Related issues

• Related to #5870 (closed)