Add meta and OG description

Author: hugovk

_layouts/default.html

@@ -15,6 +15,13 @@
     type="image/x-icon"
     href="https://raw.githubusercontent.com/helsinki-python/logo/main/HelPy-200.png">
   <meta property="og:title" content="{{ page.title }}">
+{%- if page.description %}
+  <meta name="description" content="{{ page.description }}">
+  <meta property="og:description" content="{{ page.description }}">
+{%- else %}
+  <meta name="description" content="A local usergroup for the Greater Helsinki region meeting up roughly every month">
+  <meta property="og:description" content="A local usergroup for the Greater Helsinki region meeting up roughly every month">
+{%- endif %}
   <meta property="og:type" content="website">
   <meta property="og:image" content="https://raw.githubusercontent.com/helsinki-python/logo/main/HelPy-200.png">
   <meta property="og:image:alt" content="Helsinki Python logo">

code-of-conduct.md

@@ -1,6 +1,7 @@
 ---
 layout: default
 title: Helsinki Python - Code of conduct
+description: We value the participation of each member of the Python community and want all attendees to have an enjoyable and fulfilling experience. Accordingly, all attendees are expected to show respect and courtesy to other attendees at all Helsinki Python events
 ---
 
 # Code of conduct