[feature] Process outgoing Move from clientAPI (#2750)

* prevent moved accounts from taking create-type actions

* update move logic

* federate move out

* indicate on web profile when an account has moved

* [docs] Add migration docs section

* lock while checking + setting move state

* use redirectFollowers func for clientAPI as well

* comment typo

* linter? i barely know 'er!

* Update internal/uris/uri.go

Co-authored-by: Daenney <daenney@users.noreply.github.com>

* add a couple tests for move

* fix little mistake exposed by tests (thanks tests)

* ensure Move marked as successful

* attach shared util funcs to struct

* lock whole account when doing move

* move moving check to after error check

* replace repeated text with error func

* linterrrrrr!!!!

* catch self follow case

---------

Co-authored-by: Daenney <daenney@users.noreply.github.com>

web/template/profile.tmpl

@@ -17,10 +17,31 @@
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */ -}}
 
+{{- define "profileMovedTo" -}}
+{{- with .account.Moved }}
+<div class="moved-to">
+    <b>
+        ℹ️ This account has permanently moved to
+        <a
+            href="{{ .URL }}"
+            class="nounderline"
+            rel="nofollow noreferrer noopener"
+            target="_blank"
+        >
+            @{{ .Username }}
+        </a>
+    </b>
+</div>
+{{- end }}
+{{- end -}}
+
 {{- with . }}
 <main class="profile">
     <h2 class="sr-only">Profile for {{ .account.Username -}}</h2>
     <section class="profile-header" role="region" aria-label="Basic info">
+        {{- if .account.Moved }}
+        {{- include "profileMovedTo" . | indent 2 }}
+        {{- end }}
         <div class="header-image-wrapper">
             <img
                 src="{{- .account.Header -}}"