Index every post from a list of accounts.

[berkes]

Some other bots post jobs as well. We might want to index all their posts.

E.g.

• https://botsin.space/@jobbit
• https://fosstodon.org/@fossjobs
• https://a.gup.pe/u/jobsecoevo

This should be a list in a file read at runtime, similar to job_tags.txt so that we can easily add and remove them.