Convert markdown inline links to reference style links

[spwoodcock]

Problem

We use the inline style of markdown links for all .md files:
[link here](https://website.com/some/link)

This creates linting errors due to line length, and is also not the preferred approach with markdown.

Solution

Use reference style links in all markdown files:

[link here][1]

... end of file
[1]: https://website.com/some/link

The reference is not limited by line length.

Task

Update all .md files under docs to use references for links and images.

An example of the correct format can be found here: https://github.com/hotosm/fmtm/blob/development/docs/index.md

Related Tasks

A smaller chunk of #921

[cordovez]

Hi all,
I would like to have a crack at this if you still need it done.

[spwoodcock]

Hi @cordovez !

It would be a huge help if you could - thanks so much 🙏

[cordovez]

done