- Added missing Vue UI color CSS variables to css-snippets.md

- Updated tags list contents and appearance in server-maintenance.md
- Fixed incorrect header formatting on imgui-window-tutorial.md
- Fixed missing WIP warning on imgui-windows.md, lua-mods.md, ui-apps.md

docs/en/beamng/dev/modding/lua-mods.md

@@ -1,2 +1,10 @@
+!!! warning "This site is under construction!"
+
+    This site is being actively worked on. 
+    
+    Feel you could help? Please do by clicking on the page with a pencil on the right!
+
+    This can be done any page too.
+    
 # lua-mods.md
 This page needs creating