This PR adds a new section to the documentation to contain workarounds for running
GtS on slow hardware. Right now it only contains a procedure on how to run migrations
on a different database instance in case the original database is too slow to finish
a database migration in a timely manner.
Reviewed-on: https://codeberg.org/superseriousbusiness/gotosocial/pulls/4457
Co-authored-by: Daniël Franke <df@ponc.tech>
Co-committed-by: Daniël Franke <df@ponc.tech>
