chore: switched to new build system for css.

- added community.bundle.less file to create css bundle
- removed the obsolete build.json in favor of new build system
- updated the paths in the books
- removed the imported urls from css files (the new build system doesn't support that)
- removed obsolete lms.css

community/public/css/style.css

@@ -1,5 +1,3 @@
-@import url("https://cdn.jsdelivr.net/npm/bootstrap-icons@1.4.1/font/bootstrap-icons.css");
-@import url("https://use.fontawesome.com/releases/v5.13.0/css/all.css");
 
 :root {
   --c1: #fefae0;
@@ -26,7 +24,7 @@
   --send-message: var(--c7);
   --received-message: var(--c8);
 
-  --primary-color: #08B74F;
+  --primary-color: #08B74F !important;
 }
 
 body {