Cat Command

[WyvernIXTL]

This pull request adds the cat command. This command enables the end user to see the source of the schema/template with ibi cat <path>.
Also the template is rendered in a sandboxed environment now.

[codecov]

Codecov Report

Attention: Patch coverage is 30.00000% with 21 lines in your changes missing coverage. Please review.

Project coverage is 76.82%. Comparing base (0ac1089) to head (360e4b5).
Report is 1 commits behind head on main.

Files	Patch %	Lines
installation_instruction/helpers.py	30.00%	21 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #19       +/-   ##
===========================================
- Coverage   88.88%   76.82%   -12.07%     
===========================================
  Files           4        4               
  Lines         126      151       +25     
===========================================
+ Hits          112      116        +4     
- Misses         14       35       +21     

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