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

docker/Dockerfile.alpine

@@ -0,0 +1,9 @@
+FROM nimlang/nim:1.6.4-alpine
+
+RUN apk --no-cache add libsass-dev sqlite3 libsass
+
+WORKDIR /app
+COPY . /app
+
+# install dependencies
+RUN nimble install -Y