Minor change: Add edit profile button onto self user card

All this does is checks if the profile belongs to you, and if so, adds a link that opens your profile settings

I think this improves workflow and addresses how new pleroma users constantly ask me "Wait how do I edit my profile" because they're looking for this feature to be there and not finding it.

Tested working with develop branch via npm run dev (screenshot taken on Disqordia.space)

src/components/settings_modal/tabs/general_tab.js

@@ -50,6 +50,7 @@ const GeneralTab = {
       return this.$store.state.instance.background &&
         !this.$store.state.users.currentUser.background_image
     },
+    instanceShoutboxPresent () { return this.$store.state.instance.shoutAvailable },
     ...SharedComputedObject()
   }
 }