added mermaid graphics to allmark like seen on gitlab, minor CSS twea…

[elWyatt]

…ks to add borders to tables

use mermaid like this in markdown files:

graph TD
	A[Christmas] -->|Get money| B(Go shopping)
	B --> C{Let me think}
	C -->|One| D[Laptop]
	C -->|Two| E[iPhone]
	C -->|Three| F[fa:fa-car Car]