[tech] Pre-generated trust stores for various Gemini clients

[nervuri]

Update:

The trust stores [1] are now being generated using Lupa's list of
capsules [2], merged with the list from geminispace.info [3].  The
resulting hosts file contains 1124 capsules, 231 more than it did at the
end of April, when this project started.  The certificates directory
currently contains 1100 certs.

[1] https://tildegit.org/nervuri/trust-stores
[2] gemini://gemini.bortzmeyer.org/software/lupa/lupa-capsules.txt
[3] gemini://geminispace.info/known-hosts