Use one name for each thing the UI shows (closes #399)

The UI gave one thing several names. The `database` type is now Archive in the type list, on its badge and on the edit page, and its settings read "Archive expiry" and "Archive rotation" everywhere. The retry field is "Delivery attempts", with help text, errors and the target list saying it counts every attempt; a stored 0 shows as one attempt. The target list uses one capitalisation. The navbar says "Sign out", the sign-in page "Sign in", and the resubmit notice "webhook" instead of "source". The README follows. Stored values, their meaning, routes and form field names are unchanged.

Model: opus-5-5

templates/target_edit.html

@@ -7,7 +7,7 @@
     <div class="mb-6">
         <a href="/hook/{{.Webhook.ID}}" class="btn-small">&larr; Back to {{.Webhook.Name}}</a>
         <h1 class="text-2xl font-medium text-gray-900 mt-2">Edit Target</h1>
-        <p class="text-sm text-gray-500 mt-1">Type: {{.Target.Type}}. A target's type cannot be changed; create a new target to deliver a different way.</p>
+        <p class="text-sm text-gray-500 mt-1">Type: {{if eq .Target.Type "database"}}archive{{else}}{{.Target.Type}}{{end}}. A target's type cannot be changed; create a new target to deliver a different way.</p>
     </div>
 
     <div class="card p-6">
@@ -59,7 +59,7 @@
 
             {{if eq .Target.Type "database"}}
             <div class="form-group">
-                <label for="expiry" class="label">Archive Expiry</label>
+                <label for="expiry" class="label">Archive expiry</label>
                 <select id="expiry" name="expiry" class="input">
                     {{range .ArchiveExpiryChoices}}
                     <option value="{{.Value}}"{{if .Selected}} selected{{end}}>{{.Label}}</option>
@@ -69,7 +69,7 @@
             </div>
 
             <div class="form-group">
-                <label for="rotation" class="label">Archive Rotation</label>
+                <label for="rotation" class="label">Archive rotation</label>
                 <select id="rotation" name="rotation" class="input">
                     {{range .ArchiveRotationChoices}}
                     <option value="{{.Value}}"{{if .Selected}} selected{{end}}>{{.Label}}</option>
@@ -81,9 +81,9 @@
 
             {{if or (eq .Target.Type "http") (eq .Target.Type "slack")}}
             <div class="form-group">
-                <label for="max_retries" class="label">Max retries</label>
+                <label for="max_retries" class="label">Delivery attempts</label>
                 <input type="number" id="max_retries" name="max_retries" value="{{.TargetForm.MaxRetries}}" min="0" max="20" class="input">
-                <p class="text-xs text-gray-500 mt-1">This is the total number of delivery attempts, not retries on top of the first: a value of 3 makes three attempts in all. 0 means a single attempt with no retries and no circuit breaker.</p>
+                <p class="text-xs text-gray-500 mt-1">How many times each delivery is attempted in all, the first attempt included. 0 means a single attempt with no retries and no circuit breaker.</p>
             </div>
             {{end}}