docs: Updated README to remove references of old pre-flight checks

[quixoticmonk]

Summary

Updates the README to remove the references of pre/post-flight checks from the process.

Changes

• Updated README to remove the pre/post-flight checks with the intent post v0.9.0
• Updated the usage details form the changes in argument prompts

User experience

Users will not be able to specify the pre/post flight checks on the upgrade process.

Checklist

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• I have performed a self-review of this change
• Changes have been tested
• Changes are documented

Acknowledgment

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[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: +12.01 🎉

Comparison is base (c5e406b) 27.55% compared to head (1fea4c6) 39.56%.

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Additional details and impacted files

@@             Coverage Diff             @@
##             main     #114       +/-   ##
===========================================
+ Coverage   27.55%   39.56%   +12.01%     
===========================================
  Files          14       13        -1     
  Lines        1938     1337      -601     
===========================================
- Hits          534      529        -5     
+ Misses       1404      808      -596     

see 5 files with indirect coverage changes

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[mbeacom]

lgtm