Create a style for H6 filename designation and for H4 references.

Use H6 for only for filenames, which should normally precede code listings

###### file README.md

Use H4 for a section called Reference within a page:

#### Reference (or References if more than one)

See See the [Front matter](https://vuepress.vuejs.org/guide/markdown.html#front-matter) in
the official VuePress documentaton

You can disable the navbar in YAML with navbar: false Also sidebar: false works too

https://github.com/vuejs/vuepress/blob/master/docs/.vuepress/config.js

https://github.com/vuejs/vuepress/blob/master/docs/.vuepress/config.js

See if that's only for the default theme. I assume it is.

## I got yer table of contents right here                                                                              
                                                                                                                       
[[toc]]    

Mention https://www.markdowntutorial.com

config-title.md should be reorganized and may be broken. Move the action above the illustrated examples. I also think it's no longer accurate.

This fails, even though the image seems to be there:

markdown.md: Add info about escaping

style-overriding-default.md needs to recognize the split