Description of proposed changes

• delete the docs/environment.yml file because it can be replaced by the requirements.txt file:

  • all dependencies are available in conda-forge
  • no dependencies requires special pip install, as provided by environment.yml

• docs/installation:

  • update command that use environment.yml
  • add mamba install mintpy example

Reminders

• Pass Pre-commit check (green)
• Pass Codacy code review (green)
• Pass Circle CI test (green)
• Make sure that your code follows our style. Use the other functions/files as a basis.
• If modifying functionality, describe changes to function behavior and arguments in a comment below the function declaration.