Add item bookmark buttons (#14)

Implemented as a toggle button

- Move init_cap func where web can see it
- Bump version to alpha7

src/app-config.php

@@ -1,7 +1,7 @@
 <?php
 
 /** The current Feed Reader Central version */
-const FRC_VERSION = '1.0.0-alpha6';
+const FRC_VERSION = '1.0.0-alpha7';
 
 spl_autoload_register(function ($class) {
     $file = implode(DIRECTORY_SEPARATOR, [__DIR__, 'lib', "$class.php"]);
@@ -18,3 +18,17 @@ Data::ensureDb();
 
 /** @var string The date the world wide web was created */
 const WWW_EPOCH = '1993-04-30T00:00:00+00:00';
+
+/**
+ * Capitalize the first letter of the given string
+ *
+ * @param string $value The string to be capitalized
+ * @return string The given string with the first letter capitalized
+ */
+function init_cap(string $value): string {
+    return match (strlen($value)) {
+        0       => "",
+        1       => strtoupper($value),
+        default => strtoupper(substr($value, 0, 1)) . substr($value, 1),
+    };
+}