いろいろ増えてた
$ grep .well-known/ config/routes.rb
get '.well-known/host-meta', to: 'well_known/host_meta#show', as: :host_meta, defaults: { format: 'xml' }
get '.well-known/nodeinfo', to: 'well_known/nodeinfo#index', as: :nodeinfo, defaults: { format: 'json' }
get '.well-known/webfinger', to: 'well_known/webfinger#show', as: :webfinger
get '.well-known/change-password', to: redirect('/auth/edit')
get '.well-known/keybase-proof-config', to: 'well_known/keybase_proof_config#show'