Merge branch 'length-limit-bio' into 'develop'

Add configurable length limits for `User.bio` and `User.name`

See merge request pleroma/pleroma!1515

diff --cc CHANGELOG.md
Simple merge

diff --cc config/config.exs
Simple merge

diff --cc docs/config.md
Simple merge

diff --cc lib/pleroma/user.ex
Simple merge

diff --cc test/user_test.exs
Simple merge