fix `meta.repositoryUrl`
currently, new installs get https://activitypub.software/TransFem-org/Sharkey/-/blob/develop/packages/backend/migration/1557761316509-AddSomeUrls.js?ref_type=heads which makes the repositoryUrl
point at git.joinsharkey.org
older installs may still have that point at github
add a new migration, that does
update meta
set repositoryUrl='https://activitypub.software/TransFem-org/Sharkey'
where repositoryUrl='https://github.com/transfem-org/sharkey'
or repositoryUrl='https://git.joinsharkey.org/Sharkey/Sharkey'
and then alters the default value (so new installs get the new value)