Update Rafiki style guide with custom table styles

[brad-dow]

Update https://interledger.net/content/rafiki/ with something similar to the following:

overflow-table -> this should work for most larger tables
A long and wide table (vertical and horizontal scrollbars on overflow) with regular columns

overflow-table wide-column
A long and wide table (vertical and horizontal scrollbars on overflow) that needs extra wide columns to accommodate text formatted as code (variable names, etc.)

overflow-table wider-column
A long and wide table (vertical and horizontal scrollbars on overflow) that needs even larger, extra wide columns to accommodate text formatted as code (variable names, etc.)

I'm a bit unsure of the differences between wide-column and wider-column, but we can figure those out as we go.

[huijing]

@brad-dow wide-column sets the minimum width of the table (sum total width of all columns) to 60rem, while wider-column sets the minimum width of the table to 80rem.
What this means is that columns with normal content have more room to stretch out with wider-column