Add ability for users to remove themselves as maintainers

app/templates/packages/edit_maintainers.html

@@ -12,6 +12,7 @@
 	<p>
 		{{ _("Maintainers are given write access to the package.") }}
 		{{ _("Depending on their rank, they will be able to edit the package, create releases and screenshots, and read private threads.") }}
+		{{ _("Maintainers cannot add or remove other maintainers, but can remove themselves.") }}
 	</p>
 
 	<form method="POST" action="" class="tableform">

app/templates/packages/view.html

@@ -272,6 +272,13 @@
 									{{ user.display_name }}
 								</a>
 							{% endfor %}
+
+							{% if current_user in package.maintainers and not package.checkPerm(current_user, "EDIT_MAINTAINERS") %}
+								<form class="mt-2"  method="post" action="{{ package.getRemoveSelfMaintainerURL() }}">
+									<input type="hidden" name="csrf_token" value="{{ csrf_token() }}" />
+									<input class="btn btn-sm btn-link p-0" type="submit" value="{{ _("Remove myself") }}" />
+								</form>
+							{% endif %}
 						</td>
 					</tr>
 				</table>