fix: app pack and app install help was hidden in the README text

[shazron]

Closes #757

How Has This Been Tested?

• npm test

Types of changes

• [X] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [X] I have signed the Adobe Open Source CLA.
• [ ] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [X] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [X] All new and existing tests passed.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (f27eaaf) 100.00% compared to head (b419356) 100.00%. Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #758 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 56 56 Lines 3236 3230 -6 Branches 612 612 ========================================= - Hits 3236 3230 -6 ```

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