Fix og:url to use static base URL instead of template path

Author: shankar-gpio

docs/theme/head.hbs

@@ -2,7 +2,7 @@
 <meta property="og:title" content="{{ title }} - Reframe">
 <meta property="og:description" content="Open source rules engine for universal message transformation. Transform SWIFT MT to ISO 20022 with auditable JSONLogic rules.">
 <meta property="og:type" content="website">
-<meta property="og:url" content="https://sandbox.goplasmatic.io/{{ path }}">
+<meta property="og:url" content="https://sandbox.goplasmatic.io/">
 <meta property="og:image" content="https://sandbox.goplasmatic.io/img/og-image.png">
 <meta property="og:site_name" content="Reframe Documentation">