Fix VitePress base path for GitHub Pages subdirectory deployment

GitHub Pages serves at /dotnet.CI.template/ which requires
setting base in VitePress config to resolve assets correctly.

Made-with: Cursor

Author: Hongwei-MB

docs/.vitepress/config.ts

@@ -3,6 +3,7 @@ import { defineConfig } from 'vitepress'
 export default defineConfig({
   title: 'dotnet.CI.template',
   description: 'Production-ready .NET CI/CD template',
+  base: '/dotnet.CI.template/',
 
   locales: {
     root: {