Describe deployment after deploy & update

[jjmachan]

• show the description after each deployment or update command
• started with the DEPLOYMENT.md file to document the development-related steps for contributors.

[codecov]

Codecov Report

Merging #69 (6aa45fd) into main (e8cccc4) will increase coverage by 0.29%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #69      +/-   ##
==========================================
+ Coverage   64.13%   64.42%   +0.29%     
==========================================
  Files          15       15              
  Lines         750      745       -5     
==========================================
- Hits          481      480       -1     
+ Misses        269      265       -4     

Flag	Coverage Δ
unit-tests	64.42% <100.00%> (+0.29%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
bentoctl/cli/__init__.py	61.36% <100.00%> (+0.53%)	⬆️
bentoctl/cli/utils.py	90.62% <100.00%> (+1.33%)	⬆️

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