Generation of documentation

[palmskog]

Many kinds of documentation of a project like this are useful. Here is an attempt to break down different kinds of documentation and provide hints about how they can be generated:

• Project metadata, including short descriptions of what the project is about (1 sentence, 1 paragraph, ...)
  see example from the Coq community
• Changelog summarizing how the project has evolved, for example using the Keep a Changelog format
  see example from the Coq community
• Learning resources, such as listing of examples and step-by-step tutorials
  see example from the Coq community
• Website which organizes and contains the all of the above, preferably mostly auto-generated
  see example from the Coq community

This issue is connected to #102, since releases usually deserve special documentation.