update readme with new option

Signed-off-by: lucasew <lucas59356@gmail.com>

README.md

@@ -6,4 +6,9 @@ It supports theoretically infinite nesting of notes.
 
 You can add custom icons for the pages and use cascade to apply the same icons to nested pages.
 
-Wikilink metadata is generated from Obsidian using [this extension](https://github.com/lucasew/obsidian-metadump).
+Wikilink metadata is generated from Obsidian using [this extension](https://github.com/lucasew/obsidian-metadump).
+
+# Options
+These are changeable using the `params` attribute in your site configuration file. See [this](https://gohugo.io/variables/site/#the-siteparams-variable) for more information.
+
+- `disableObsidian`: ignore the `meta.json` generated by Obsidian using obsidian-metadump. This will disable backlinks and wikilinks and will make things a lot faster (~16x in my vault with ~1.1k markdown files) because the hot parts of the template are these.