Add pager to the branches page (#14202)

* Add pager to the branches page

* override pageSize if bigger than max

* Make branches commit range configurable

Co-authored-by: zeripath <art27@cantab.net>
Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: silverwind <me@silverwind.io>

templates/repo/branch/list.tmpl

@@ -127,6 +127,7 @@
 					</tbody>
 				</table>
 			</div>
+			{{template "base/paginate" .}}
 		{{end}}
 	</div>
 </div>