Fix docs meta tags

docs/_overrides/main.html

@@ -9,7 +9,7 @@
 <!-- assets absolute URL -->
 {% set assets = config.site_url ~ 'assets' %}
 
-{% block site_meta %}
+{% block extrahead %}
 <meta name="application-name" content="{{ config.site_name }}">
 <meta name="msapplication-TileColor" content="#FFFFFF">
 <meta name="msapplication-TileImage" content="{{ assets }}/meta/mstile-144x144.png">
@@ -22,6 +22,7 @@
 <meta property="og:description" content="{{ config.site_description }}">
 <meta property="og:url" content="{{ page.canonical_url }}">
 <meta property="og:image" content="{{ assets }}/meta/card.png">
+<meta property="og:image:alt" content="{{ config.site_name }}">
 <meta property="og:image:type" content="image/png">
 <meta property="og:image:width" content="1280">
 <meta property="og:image:height" content="640">
@@ -33,9 +34,7 @@
 <meta name="twitter:image" content="{{ assets }}/meta/card.png">
 <meta name="google-site-verification" content="{{ config.extra.seo.google }}">
 <meta name="msvalidate.01" content="{{ config.extra.seo.bing }}">
-{% endblock %}
 
-{% block extrahead %}
 <link rel="apple-touch-icon-precomposed" sizes="57x57" href="{{ assets }}/meta/apple-touch-icon-57x57.png">
 <link rel="apple-touch-icon-precomposed" sizes="114x114" href="{{ assets }}/meta/apple-touch-icon-114x114.png">
 <link rel="apple-touch-icon-precomposed" sizes="72x72" href="{{ assets }}/meta/apple-touch-icon-72x72.png">

docs/assets/stylesheets/extra.css

@@ -0,0 +1,19 @@
+.md-logo {
+  width: 40px;
+  height: 40px;
+  padding-bottom: 2px;
+  padding-top: 2px;
+}
+
+.md-logo img {
+  width: 40px;
+  height: 40px;
+}
+
+.md-header-nav__title {
+  font-size: .85rem;
+}
+
+.md-typeset__table code {
+  word-break: normal;
+}

docs/css/extra.css

@@ -1,3 +0,0 @@
-.md-typeset__table code {
-  word-break: normal;
-}

mkdocs.yml

@@ -20,7 +20,7 @@ extra:
 
 theme:
   name: material
-  custom_dir: docs/overrides
+  custom_dir: docs/_overrides
   language: en
   palette:
     scheme: default
@@ -29,16 +29,13 @@ theme:
   font:
     text: Roboto
     code: Roboto Mono
-  i18n:
-    prev: Previous
-    next: Next
   logo: assets/logo.png
   favicon: assets/favicon.ico
   include_search_page: false
   search_index_only: true
 
 extra_css:
-  - css/extra.css
+  - assets/stylesheets/extra.css
 
 markdown_extensions:
   - admonition
@@ -59,6 +56,7 @@ markdown_extensions:
 plugins:
   - exclude:
       glob:
+        - "_overrides/*"
         - "Dockerfile"
   - git-revision-date-localized:
       type: iso_datetime