Initial commit: nimforum with BaraDB backend

- Replaced SQLite with BaraDB via TCP wire protocol
- Added baradb_client.nim and baradb_sqlite.nim adapter
- Renamed SQL keywords: status->usrStatus, key->sessionKey, like->postLike
- Added NOW() support for datetime defaults
- Switched Jester to asynchttpserver (-d:useStdLib) to avoid thread/GC issues
- Frontend built and favicon added

localhost.local/public/css/custom-style.scss

@@ -0,0 +1,16 @@
+// Use this to customise the styles of your forum.
+$primary-color: #6577ac;
+$body-font-color: #292929;
+$dark-color: #505050;
+$label-color: #7cd2ff;
+$secondary-btn-color: #f1f1f1;
+
+// Define nav bar colours.
+$body-bg: #ffffff;
+$navbar-color: $body-bg;
+$navbar-border-color-dark: $body-bg;
+$navbar-primary-color: #e80080;
+
+#main-navbar input#search-box {
+  border: 1px solid #e6e6e6;
+}