Add blog to docs (#484)

* Adding social card infrastructure
* Upgrades doc project to .NET 6
* Adds Playwright
* Changes the console to a web project for Playwright
* Adds social card template
* Added blog content
* Parallelized social image processing
* Updating CI to use .NET 6 for docs build

docs/input/widgets/calendar.md

@@ -1,6 +1,11 @@
 Title: Calendar
 Order: 40
 RedirectFrom: calendar
+Description: "The **Calendar** is used to render a calendar to the terminal."
+Highlights:
+    - Include highlighted events.
+    - Culture aware.
+    - Custom headers.
 ---
 
 The `Calendar` is used to render a calendar to the terminal.