docs + various polish

content/features/Mermaid diagrams.md

@@ -0,0 +1,10 @@
+> [!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()`.
+
+```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!
+```