chore: release v1.1.2

Add a Changelog page that renders CHANGELOG.md from the header menu,
switch the default color theme to the brand-accurate Stalwart theme, and
document all changes since v1.1.1.

package.json

@@ -1,7 +1,7 @@
 {
   "name": "stalwart-webui-fork",
   "private": true,
-  "version": "1.1.1",
+  "version": "1.1.2",
   "description": "Stalwart WebUI Fork",
   "type": "module",
   "scripts": {