chore: Add sh-e files to gitignore and improve readme for install script

[BenjaminEmiliani]

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[cypress]

spartacus    Run #52503

Run Properties:   Passed #52503  •  563bf7070f ℹ️: Merge 2b0e7acb2a7510f351c7e5d47a37082f7709d696 into 0236087010f2bd2645631899821e...

Project	spartacus
Branch Review	improve_install_script_readme
Run status	Passed #52503
Run duration	04m 19s
Commit	563bf7070f ℹ️: Merge 2b0e7acb2a7510f351c7e5d47a37082f7709d696 into 0236087010f2bd2645631899821e...
Committer	Benjamin Emiliani
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Test results
Failures	0
Flaky	3
Pending	0
Skipped	0
Passing	101
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Please push a commit to re-trigger the build.
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Please push a commit to re-trigger the build.
To push an empty commit you can use `git commit --allow-empty -m "Trigger Build"`

[github-actions]

Merge Checks Failed

Please push a commit to re-trigger the build.
To push an empty commit you can use `git commit --allow-empty -m "Trigger Build"`

[github-actions]

Merge Checks Failed

Please push a commit to re-trigger the build.
To push an empty commit you can use `git commit --allow-empty -m "Trigger Build"`

[github-actions]

Merge Checks Failed

Please push a commit to re-trigger the build.
To push an empty commit you can use `git commit --allow-empty -m "Trigger Build"`