Add ability to ignore headers when generating toc (#127)

* Added ability to ignore some or all headings when generating toc in sidebar

* Added documentation for ignoring sub headers

* Fixed minor test issues

docs/more-pages.md

@@ -68,3 +68,25 @@ A custom sidebar can also automatically generate a table of contents by setting
 </script>
 <script src="//unpkg.com/docsify/lib/docsify.min.js"></script>
 ```
+
+## Ignoring Subheaders
+
+When `subMaxLevel` is set, each header is automatically added to the table of contents by default. If you want to ignore a specific header, add `{docsify-ignore}` to it.
+
+```markdown
+# Getting Started
+
+## Header {docsify-ignore}
+This header won't appear in the sidebar table of contents.
+```
+
+To ignore all headers on a specific page, you can use `{docsify-ignore-all}` on the first header of the page.
+
+```markdown
+# Getting Started {docsify-ignore-all}
+
+## Header
+This header won't appear in the sidebar table of contents.
+```
+
+Both `{docsify-ignore}` and `{docsify-ignore-all}` will not be rendered on the page when used.