feat: tooltip on url field, with message on validation

templates/download.html

@@ -15,7 +15,7 @@
         <form hx-post="/download" hx-target="#get-btn" hx-swap="outerHTML" hx-indicator="#progress">
                 <div class="grid">
                     <div hx-target="this" hx-swap="outerHTML">
-                        <label>Link
+                        <label data-tooltip="Link can be on any platform!">Link
                             <input 
                             type="url" id="URL" name="URL" 
                             hx-post="/valid-link" hx-indicator="#url-validation-progress" required>

templates/url-validation.html

@@ -1,5 +1,7 @@
 <div hx-target="this" hx-swap="outerHTML">
-    <label>
+    <label 
+        data-tooltip="{{ if .Valid }}Link is Valid{{ else }}Link is invalid{{ end }}" 
+        >
         Link
         <input name="URL" id="URL" type="url" hx-post="/valid-link" 
         aria-invalid="{{ if .Valid }}false{{ else }}true{{ end }}"