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

static/css/style.css

@@ -1,59 +1 @@
-/* Webhooker main stylesheet */
-body {
-    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
-} 
-
-/* Custom styles for Webhooker */
-
-/* Navbar customization */
-.navbar-brand {
-    font-weight: 600;
-    font-size: 1.5rem;
-}
-
-/* Card hover effects */
-.card {
-    transition: transform 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
-}
-
-.card:hover {
-    transform: translateY(-5px);
-    box-shadow: 0 10px 30px rgba(0,0,0,0.15) !important;
-}
-
-/* Background opacity utilities */
-.bg-opacity-10 {
-    background-color: rgba(var(--bs-success-rgb), 0.1);
-}
-
-.bg-primary.bg-opacity-10 {
-    background-color: rgba(var(--bs-primary-rgb), 0.1);
-}
-
-/* User dropdown styling */
-.navbar .dropdown-toggle::after {
-    margin-left: 0.5rem;
-}
-
-.navbar .dropdown-menu {
-    margin-top: 0.5rem;
-}
-
-/* Footer styling */
-footer {
-    margin-top: auto;
-    padding: 2rem 0;
-    background-color: #f8f9fa;
-    border-top: 1px solid #dee2e6;
-}
-
-/* Responsive adjustments */
-@media (max-width: 768px) {
-    .display-4 {
-        font-size: 2.5rem;
-    }
-    
-    .card {
-        margin-bottom: 1rem;
-    }
-} 
+/* Webhooker custom styles — see input.css for Tailwind theme */