docs(feat): finish documentation

Go also https://docs.staringplanet.top/primitive-type later to see the
docs later.

docs/serve_docs.sh

@@ -0,0 +1,11 @@
+#!/bin/sh
+
+LANG_CODE=$1
+
+if [ -n "$LANG_CODE" ]; then
+  echo "Starting docs preview for language: $LANG_CODE..."
+  sphinx-autobuild -D language="$LANG_CODE" --port 8000 source/ "build/html_$LANG_CODE/"
+else
+  echo "Starting docs preview in English (en_US)..."
+  sphinx-autobuild --port 8000 source/ build/html/
+fi