Merge pull request #15 from GradleUp/logos

Logos and Opengraph colors

Author: oleg-nenashev

assets/images/logo-dark.png

@@ -47,7 +47,9 @@ plugins:
   - autorefs
   - macros
   - mkdocs-pdf
-  - social
+  - social:
+      cards_layout_options:
+        background_color: "#2A465B"
   - same-dir
   - group:
       enabled: !ENV [FULL_BUILD, true]
@@ -159,7 +161,7 @@ theme:
     text: DM Sans
     code: Roboto Mono
   favicon: assets/images/logo-square.png
-  logo: assets/images/logo.png
+  logo: assets/images/logo-dark.png
   icon:
     repo: fontawesome/brands/github