Fix #403 by moving documentation to separate directory to avoid merge conflicts (#405)

docs/features/Mermaid diagrams.md

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+Quartz supports Mermaid which allows you to add diagrams and charts to your notes. Mermaid supports a range of diagrams, such as [flow charts](https://mermaid.js.org/syntax/flowchart.html), [sequence diagrams](https://mermaid.js.org/syntax/sequenceDiagram.html), and [timelines](https://mermaid.js.org/syntax/timeline.html). This is enabled as a part of [[Obsidian compatibility]] and can be configured and enabled/disabled from that plugin.
+
+By default, Quartz will render Mermaid diagrams to match the site theme.
+
+> [!warning]
+> Wondering why Mermaid diagrams may not be showing up even if you have them enabled? You may need to reorder your plugins so that `Plugin.ObsidianFlavoredMarkdown()` is _after_ `Plugin.SyntaxHighlighting()`.
+
+## Syntax
+
+To add a Mermaid diagram, create a mermaid code block.
+
+````
+```mermaid
+sequenceDiagram
+    Alice->>+John: Hello John, how are you?
+    Alice->>+John: John, can you hear me?
+    John-->>-Alice: Hi Alice, I can hear you!
+    John-->>-Alice: I feel great!
+```
+````
+
+```mermaid
+sequenceDiagram
+    Alice->>+John: Hello John, how are you?
+    Alice->>+John: John, can you hear me?
+    John-->>-Alice: Hi Alice, I can hear you!
+    John-->>-Alice: I feel great!
+```