docs: enable auto-deploy Doxygen API reference to GitHub Pages

Author: Johnson-Ogundeji

.github/workflows/docs.yml

@@ -1,7 +1,12 @@
 name: Docs
-# Disabled: GitHub Pages requires the repo to be public (or an Enterprise plan).
-# Re-enable the push trigger when the repo is made public.
 on:
+  push:
+    branches: [ main ]
+    paths:
+      - 'include/signet/**'
+      - 'doxygen/**'
+      - 'Doxyfile'
+      - '.github/workflows/docs.yml'
   workflow_dispatch: {}
 permissions:
   contents: read

doxygen/mainpage.md

@@ -2,7 +2,7 @@
 
 **C++20 Parquet library with AI-native extensions — zero mandatory dependencies.**
 
-[GitHub Repository](https://github.com/SIGNETSTACK/signet-forge)
+[GitHub Repository](https://github.com/SIGNETSTACK/SIGNET_FORGE)
 
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