docs/manual: add plugins page

This should be helpful for listing known plugin behaviour where the behaviour is undesirable, but also unfixable

docs/manual/manual.md

@@ -17,6 +17,10 @@ configuring.md
 hacking.md
 ```
 
+```{=include=} appendix html:into-file=//plugins.html
+plugins.md
+```
+
 ```{=include=} appendix html:into-file=//options.html
 options.md
 ```

docs/manual/plugins.md

@@ -0,0 +1,13 @@
+# Plugin specific quirks {#ch-plugins}
+
+At times, certain plugins refuse to play nicely. Be it as a result of generating
+lua from Nix, or the state of packaging. This page shall list any plugins that
+are known to misbehave, and potential workarounds.
+
+<!--
+If adding a new section, uncomment this part and add your page to
+plugins/<page>.md
+```{=include=} chapters
+plugins/page.md
+```
+-->