Various small fixes in bobatheme

- Finish support for list page subtitle
- Change color when hovering over share buttons
- Change print button to an <a> to match the rest of the buttons
- Make the left bar of blockquote lined up with rest of text
- Fix contrast of code block Copy button
- Fix keyboard accessibility of code block Copy button

content/authors/_index.md

@@ -2,6 +2,7 @@
 
 title: Authors
 
----
+description: >-
+  List of authors on my website.
 
-List of authors on my website.
+---

content/series/_index.md

@@ -4,4 +4,4 @@ title: Series
 
 ---
 
-List of series of closely related posts.
+List of series, which are sequences of closely related posts.

themes/bobatheme

@@ -1 +1 @@
-Subproject commit 80f5994d960f4a50239d93ea94ed33e01271eb75
+Subproject commit 3fae019148411de70716cb4e55ab96cea1cd7cb8