Update JS dependencies (#15033)

* Update JS dependencies

- Update all JS dependencies
- For octicons, rename trashcan to trash
- For svgo, migrate to v2 api, output seems to have slightly changed but icons look the same
- For stylelint, update config, fix custom property duplicates
- For monaco, drop legacy Edge support
- For eslint, enable new rules, fix new issues
- For less-loader, remove deprecated import syntax

* update svgo usage in generate-images and rebuild logo.svg with it

templates/admin/monitor.tmpl

@@ -86,7 +86,7 @@
 							<td>{{.Description}}</td>
 							<td>{{DateFmtLong .Start}}</td>
 							<td>{{TimeSince .Start $.Lang}}</td>
-							<td><a class="delete-button" href="" data-url="{{$.Link}}/cancel/{{.PID}}" data-id="{{.PID}}" data-name="{{.Description}}">{{svg "octicon-trashcan" 16 "text-red"}}</a></td>
+							<td><a class="delete-button" href="" data-url="{{$.Link}}/cancel/{{.PID}}" data-id="{{.PID}}" data-name="{{.Description}}">{{svg "octicon-trash" 16 "text-red"}}</a></td>
 						</tr>
 					{{end}}
 				</tbody>