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/barchart.md

@@ -1,5 +1,10 @@
 Title: Bar Chart
 Order: 20
+Description: "Use **BarChart** to render bar charts to the console."
+Highlights:
+    - Custom colors
+    - Labels
+    - Use your own data with a converter.
 ---
 
 Use `BarChart` to render bar charts to the console.

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.

docs/input/widgets/canvas-image.md

@@ -1,5 +1,6 @@
 Title: Canvas Image
 Order: 70
+Description: "Use *ImageSharp* to parse images and render them as Ascii art to the console."
 ---
 
 To add [ImageSharp](https://github.com/SixLabors/ImageSharp) superpowers to 

docs/input/widgets/canvas.md

@@ -1,5 +1,6 @@
 Title: Canvas
 Order: 60
+Description: "**Canvas** is a widget that allows you to render arbitrary pixels to the console."
 ---
 
 `Canvas` is a widget that allows you to render arbitrary "pixels" 

docs/input/widgets/figlet.md

@@ -1,6 +1,7 @@
 Title: Figlet
 Order: 50
 RedirectFrom: figlet
+Description: "*Spectre.Console* can render FIGlet text by using the **FigletText** class."
 ---
 
 Spectre.Console can render [FIGlet](http://www.figlet.org/) text by using the `FigletText` class.

docs/input/widgets/index.cshtml

@@ -1,5 +1,6 @@
 Title: Widgets
-Order: 9
+Order: 70
+Description: "*Spectre.Console* supports many built-in widgets to help render beautiful output."
 ---
 
 <ul>

docs/input/widgets/rule.md

@@ -1,6 +1,11 @@
 Title: Rule
 Order: 30
 RedirectFrom: rule
+Description: "The **Rule** class is used to render a horizontal rule (line) to the terminal."
+Highlights:
+    - Custom colors for line and title.
+    - Specify left, center or right aligned title.
+
 ---
 
 The `Rule` class is used to render a horizontal rule (line) to the terminal.

docs/input/widgets/table.md

@@ -1,6 +1,7 @@
 Title: Table
 Order: 0
 RedirectFrom: tables
+Description: "Tables are a perfect way of displaying tabular data in a terminal. *Spectre.Console* is super smart about rendering tables and will adjust all columns to fit whatever is inside them."
 ---
 
 Tables are a perfect way of displaying tabular data in a terminal.

docs/input/widgets/tree.md

@@ -1,5 +1,9 @@
 Title: Tree
 Order: 10
+Description: "The **Tree** widget can be used to render hierarchical data."
+Highlights:
+    - Custom colors and styles for guidelines.
+    - Include any *Spectre.Console* widgets as child nodes.
 ---
 
 The `Tree` widget can be used to render hierarchical data.