Add publish-to-pages agent skill (#1035)

* Add publish-to-pages agent skill

Agent skill that publishes presentations and web content to GitHub Pages.
Works with any AI coding agent (Copilot CLI, Claude Code, Gemini CLI, etc.)

Features:
- Converts PPTX and PDF with full formatting preservation
- Creates repo, enables Pages, returns live URL
- Zero config — just needs gh CLI

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* docs: update README.skills.md

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

skills/publish-to-pages/scripts/publish.sh

@@ -0,0 +1,40 @@
+#!/bin/bash
+# Main publish script
+# Args: $1 = path to index.html, $2 = repo name, $3 = visibility (private|public), $4 = description
+set -euo pipefail
+
+HTML_FILE="$1"
+REPO_NAME="$2"
+VISIBILITY="${3:-public}"
+DESCRIPTION="${4:-Published via publish-to-pages}"
+
+USERNAME=$(gh api user --jq '.login')
+
+# Check if repo exists
+if gh repo view "$USERNAME/$REPO_NAME" &>/dev/null; then
+    echo "ERROR: Repository $USERNAME/$REPO_NAME already exists"
+    exit 1
+fi
+
+# Create repo
+gh repo create "$REPO_NAME" --"$VISIBILITY" --description "$DESCRIPTION"
+
+# Clone, push, enable pages
+TMPDIR=$(mktemp -d)
+git clone "https://github.com/$USERNAME/$REPO_NAME.git" "$TMPDIR"
+cp "$HTML_FILE" "$TMPDIR/index.html"
+cd "$TMPDIR"
+git add index.html
+git commit -m "Publish content"
+git push origin main
+
+# Enable GitHub Pages
+gh api "repos/$USERNAME/$REPO_NAME/pages" -X POST -f source[branch]=main -f source[path]=/ 2>/dev/null || true
+
+echo "REPO_URL=https://github.com/$USERNAME/$REPO_NAME"
+echo "PAGES_URL=https://$USERNAME.github.io/$REPO_NAME/"
+echo ""
+echo "GitHub Pages may take 1-2 minutes to deploy."
+
+# Cleanup
+rm -rf "$TMPDIR"