Errors on the readme (how-to, active repos) #21

On the Readme there is a link for instructions on how to add a new repo (https://github.com/gitenberg-dev/documentation/blob/master/how_to) but that page is a 404.

There is also an attempt to link to a page listing active repos but with a malformed link syntax ([this file][active-repos]) and a non-url instead of an url so can't reach that page either