feat: add prose components documentation

Author: HugoRCD

content/2.essentials/.navigation.yml

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+title: Essential

content/2.essentials/markdown-syntax.md

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+---
+title: Markdown Syntax
+description: Text, title, and styling in standard markdown.
+---
+
+## Titles
+
+Best used for page titles, headers, and sidebars.
+
+```md
+## Title
+```