Add documentation for tables

Also moves "Colors" and "Styles" sections to appendix.

docs/input/appendix/colors.md

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+Title: Colors
+Order: 0
+---
+
+The following is a list of the standard 8-bit colors supported in terminals.
+
+Note that the first 16 colors are generally defined by the system or your terminal software, and may not display exactly as rendered here.
+
+# Usage
+
+You can either use the colors in code, such as `new Style(foreground: Color.Maroon)` or
+in markup text such as `AnsiConsole.Markup("[maroon on blue]Hello[/]")`.
+
+# Standard colors
+
+<?# ColorTable /?>

docs/input/appendix/index.md

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+Title: Appendix
+Order: 10
+---

docs/input/appendix/styles.md

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+Title: Styles
+Order: 0
+---
+
+Note that what styles that can be used is defined by the system or your terminal software, and may not appear as they should.
+
+<table class="table">
+    <tr>
+        <td><code>bold</code></td>
+        <td>Bold text</td>
+    </tr>
+    <tr>
+        <td><code>dim</code></td>
+        <td>Dim or faint text</td>
+    </tr>
+    <tr>
+        <td><code>italic</code></td>
+        <td>Italic text</td>
+    </tr>
+    <tr>
+        <td><code>underline</code></td>
+        <td>Underlined text</td>
+    </tr>
+    <tr>
+        <td><code>invert</code></td>
+        <td>Swaps the foreground and background colors</td>
+    </tr>
+    <tr>
+        <td><code>conceal</code></td>
+        <td>Hides the text</td>
+    </tr>
+    <tr>
+        <td><code>slowblink</code></td>
+        <td>Makes text blink slowly</td>
+    </tr>
+    <tr>
+        <td><code>rapidblink</code></td>
+        <td>Makes text blink</td>
+    </tr>
+    <tr>
+        <td><code>strikethrough</code></td>
+        <td>Shows text with a horizontal line through the center</td>
+    </tr>
+</table>