Customize HTML page title

The existing customize feature only changed the title in the navbar.

customize.go

@@ -49,6 +49,12 @@ func loadCustomize(filename string) (customize, error) {
 	)
 }
 
+func (c *customize) defaults() {
+	if len(c.AppTitle) == 0 {
+		c.AppTitle = "OTS - One Time Secrets"
+	}
+}
+
 func (c customize) ToJSON() (string, error) {
 	j, err := json.Marshal(c)
 	return string(j), errors.Wrap(err, "marshalling JSON")

frontend/index.html

@@ -30,7 +30,7 @@
       rel="stylesheet"
     >
 
-    <title>OTS - One Time Secrets</title>
+    <title>{{ .Customize.AppTitle }}</title>
 
     <script nonce="{{ .InlineContentNonce }}">
       window.getTheme = () => localStorage.getItem('set-color-scheme') || (window.matchMedia('(prefers-color-scheme: light)').matches ? 'light' : 'dark')

main.go

@@ -73,6 +73,7 @@ func initApp() error {
 	if cust, err = loadCustomize(cfg.Customize); err != nil {
 		return errors.Wrap(err, "loading customizations")
 	}
+	cust.defaults()
 
 	frontendFS, err := fs.Sub(embeddedAssets, "frontend")
 	if err != nil {