Auto-read from user's configuration so no variables are required on deploy

[araghukas]

Changed

• Read id's from user's config instead of input (no more required args)
• Update executor config output, remove unused
• Make owners var optional
• Conform to 'alphanumeric chars only' rule for resource names
• Use templatefile instead of template_file (MacOS compatibility)

---

incorporates PRs:
#29
#27

• I have added the tests to cover my changes.
• I have updated the documentation and CHANGELOG accordingly.
• I have read the CONTRIBUTING document.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (656b8aa) 100.00% compared to head (dde77b8) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##           develop       #32   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            4         4           
  Lines          271       271           
=========================================
  Hits           271       271           

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