chore: update dependabot config for Hugo and remove legacy files

- Update dependabot.yml to track hugo-site directory instead of gatsby-site
- Change target branch from develop to main
- Remove .ruby-gemset file leftover from Jekyll era

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: tmr08c

.claude/settings.local.json

@@ -11,7 +11,9 @@
       "WebFetch(domain:github.com)",
       "Bash(find:*)",
       "WebFetch(domain:gohugo.io)",
-      "Bash(ls:*)"
+      "Bash(ls:*)",
+      "Bash(git add:*)",
+      "Bash(git commit:*)"
     ],
     "deny": []
   }

.github/dependabot.yml

@@ -6,8 +6,8 @@
 version: 2
 updates:
   - package-ecosystem: "npm" # See documentation for possible values
-    directory: "/gatsby-site" # Location of package manifests
-    target-branch: "develop"
+    directory: "/hugo-site" # Location of package manifests
+    target-branch: "main"
     schedule:
       interval: "weekly"
       day: "friday"