edited "First Steps with the Documentation Team" wiki

Hi :slight_smile:
I have edited the 1st couple of sections on the "First Steps with the Documentation Team" wiki

https://wiki.documentfoundation.org/Documentation/Development

All colour-coded to match the colours of the User Guides on the "Published" wiki-page.  Also tried re-wording the intro to get rid of the out-dated reference to an ex-competitor.  Still not completely happy with the wording so please feel free to change that (jic you didn't already feel free)

Regards from

Tom :slight_smile: