Add lightweight self-hosted Hugo CMS with GitHub API backend

Implements a Go-based CMS for editing Hugo posts and uploading images
via the GitHub REST API, with no database and Git as the source of truth.

Features:
- Single admin auth with bcrypt password and signed session cookies
- Dashboard, post listing with search, create/edit with EasyMDE editor
- Media library for static/uploads/ with drag-drop and clipboard paste
- Client-side autosave, unsaved changes warning, dark mode, responsive UI
- Modular packages for auth, github, posts, media, session, and handlers

Co-authored-by: codegirl007 <s.raide@gmail.com>

cms/cmd/hashpassword/main.go

@@ -0,0 +1,23 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"golang.org/x/crypto/bcrypt"
+)
+
+func main() {
+	if len(os.Args) < 2 {
+		fmt.Fprintln(os.Stderr, "usage: hashpassword <password>")
+		os.Exit(1)
+	}
+
+	hash, err := bcrypt.GenerateFromPassword([]byte(os.Args[1]), bcrypt.DefaultCost)
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+
+	fmt.Println(string(hash))
+}