monolithic beast no more

• Added entirely new documentation website, built using Material for Mkdocs. Thanks to @ewels for a fantastic (late-night) effort to break up and restructure what had become a fairly unwieldy monolithic beast of markdown document...

• Added docs for cytosine context summary, useful for GpC methylation or filtering for specific C context (e.g. CpA)

• Updated docs for the dovetailing

Bismark

• Warning messages for closing ambiguous and unmapped file handles only occur when these options were specified see here