Update documentation

[SigismundSchlomo]

Documentation is outdated.

Problems

• README.md
  • Doesn't contain relevant instructions. No information about database migration required after db creation.
  • Information about postman collection is outdated and unusable.
  • There are no any links to related projects
  • Looks like project could be run on it's own, but it shouldn't
  • There are no links to instructions about running own Hermes or Atlas node
• introduction.md
  • Doesn't contain information about role of this project in abrosus network
  • Should contain links to other repos of ambrosus project
• tutorial.md
  • code samples doesn't work
  • goals are unclear
  • dev.ambrosus.io link doesn't work
• ApplicationEntryTypes.md
  • goal of this document is unclear
  • there are no links to this document, so it's potentially unreachable to regular user
• BasicEventEntryTypes
  • there are no links to this document, so it's potentially unreachable to regular user
• Security.md
  • Should contain recommendations how to write good vulnerability report

What should be added

• Document code with docstrings