Replace Bootstrap with Tailwind CSS + Alpine.js

- Remove all Bootstrap CSS/JS references from templates
- Add Tailwind CSS v4 with Material Design inspired theme (input.css)
- Compile tailwind.css with standalone CLI (committed to repo)
- Vendor Alpine.js 3.14.9 for reactive UI components
- Rewrite base.html to match µPaaS layout structure
- Rewrite htmlheader.html with Tailwind CSS link
- Rewrite navbar.html with Alpine.js mobile menu toggle
- Convert index.html to Tailwind utility classes
- Convert login.html to Tailwind utility classes
- Convert profile.html to Tailwind utility classes
- Add make css target for Tailwind compilation
- Add footer template with project links

closes #4

templates/htmlheader.html

@@ -2,7 +2,7 @@
 <meta charset="UTF-8">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
 <title>{{block "title" .}}Webhooker{{end}}</title>
-<link href="/s/vendor/bootstrap/css/bootstrap.min.css" rel="stylesheet">
-<link href="/s/css/style.css" rel="stylesheet">
+<link rel="stylesheet" href="/s/css/tailwind.css">
+<style>[x-cloak] { display: none !important; }</style>
 {{block "head" .}}{{end}}
-{{end}} 
+{{end}}