Write (mk)docs for DJAM

[giohappy]

DJAM needs proper documentation.
We can use Markdown files under the docs/ folder to organize the chapters, and use a basic MkDocs configuration (see the one we used for the QGIS GeoNode Plugin as an example).

Chapters:

• Home (we can start by taking the content from the current README) -> @Gpetrak
• API Keys -> @Gpetrak
• OpenID/Oauth2
• Authenticated Proxy service
• Integration with Geoserver (to be reviewed) -> @Gpetrak
• Integration with GeoNode
• REST API (initially we can just report the API for the API Key management) @Gpetrak

[Gpetrak]

@giohappy the estimated time for this task is 2 days.

[giohappy]

@Gpetrak do your best in 1 day then we'll see, ok?

[Gpetrak]

@giohappy ok.

[Gpetrak]

@giohappy the PR for this task is available here
We can discuss about the content of the README.md file since, now it is included in the docs/index.md.

[Gpetrak]

@giohappy I created a PR directly to the main branch in which I added the link of the documentation and removed the content which exists in docs/index.md