feat: show version on website

Signed-off-by: skidoodle <contact@albert.lol>

web/layout.html

@@ -29,6 +29,15 @@
                 <div class="dim cli-label">CLI Usage</div>
                 <pre class="cli-pre">curl -F file=@yourfile {{.Host}}</pre>
             </section>
+            <footer class="footer">
+                <div class="dim">
+                    {{if eq .Version "dev"}}
+                    <a href="https://github.com/skidoodle/safebin" target="_blank" rel="noopener noreferrer">dev</a>
+                    {{else}}
+                    <a href="https://github.com/skidoodle/safebin/releases/tag/v{{.Version}}" target="_blank" rel="noopener noreferrer">v{{.Version}}</a>
+                    {{end}}
+                </div>
+            </footer>
         </div>
         <input type="file" id="file-input" class="hidden" />
         <script src="/static/app.js"></script>

web/style.css

@@ -237,10 +237,26 @@ button {
     display: none !important;
 }
 
+.footer {
+    margin-top: 20px;
+    text-align: center;
+    opacity: 0.5;
+}
+
+.footer a {
+    color: inherit;
+    text-decoration: none;
+}
+
+.footer a:hover {
+    text-decoration: underline;
+}
+
 @media (max-width: 400px) {
     .github-btn span {
         display: none;
     }
+
     .github-btn {
         padding: 6px;
     }