update docs for new mission type

[danbjoseph]

docs should be updated to include details on the new mission type. should also plan for possible future mission type(s) with any structural changes to how the docs are organized.

[Hagellach37]

the docs are currently available here: https://mapswipe-workers.readthedocs.io/en/master/readme_link.html

it would be good to update the structure of the docs to make it easier for developers and project managers where to look for information.

outdated information

• remove this page https://mapswipe-workers.readthedocs.io/en/master/contributing.html this information is already included in the readme
• remove outdated page deployment_overview
• remove outdated page updating
• remove outdated page testing
• update page dev_setup and remove parts that are not needed anymore, e.g. about travis
• update page backend_workers_cli

Data

• update data page and add information on all files that are available
• [ ]

Project types

• add new section for project types and create an entry page which gives an overview which project types are currently supported
• add page which explains what needs to be considered when implementing a new project type
• update page for buildArea project type
• update page for changeDetection project type
• update page for footprint project type

[ElJocho]

• move development to the first section
• add json object from firebase for each project type
• project_type -> update (images, descriptions) delete or refactor things from heading Data Model down to individual project_type pages
• update index: Project Types as new group same as getting started, data to getting started

[ElJocho]

Last Section Indices and Tables seems to be useless

• removed?
• Add logo with sphinx html_logo?
• Whats up with completness project type (4)?
• -> create page so that a structure exists, but it is still WIP
• progress in groups under project_type.html has been addressed
• result in project types files -> where does the json come from?

[ElJocho]

After update check if:

Data

• last table is formatted properly
• HOT Tasking Manager Geometries heading is now a proper heading