fix: adjust the window size of the help output

[threepipes]

Checklist

=========

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have checked for similar issues and haven't found anything relevant.
  • Output breaks on narrow terminals #797
  • Help output on narrow terminal #863
• This is not a security issue (which should be reported here: https://circleci.com/security/)
• I have read Contribution Guidelines.

Internal Checklist

• I am requesting a review from my own team as well as the owning team
• I have a plan in place for the monitoring of the changes that I am making (this can include new monitors, logs to be aware of, etc...)

Changes

=======

• Adjust the window size of the help output
  • Because it is broken when the terminal width is smaller than 122 characters
• Remove the CircleCI logo on the help output when the terminal width is smaller than 86 chars
  • Because the logo size can't be adjusted

Rationale

=========

This solves #797 and #863.

Considerations

==============

These are suggested solutions at #797.

Possible solutions:

• Don't draw this border at all.
• Disable the border if the window size is smaller than the bounding box size
• Allow me to disable the border

Disabling the border is already possible by passing TESTING=true(The variable name is not appropriate for public use, though).
I can also adopt the first or second solution.

Screenshots

============

Before

After

85 < Terminal width < 122

Terminal width <= 85

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[threepipes]

I removed it because cmd is passed as an argument of helpTemplate, and this cmd is not used.

[wyardley]

🙏 Thanks for this! This would also fix #863 if you want to add that to the PR description

[wyardley]

@elliotforbes any chance you could poke someone to look at this one as well?

[elliotforbes]

@wyardley - I can't claim credit for nudging here, but I've merged it in. Hoping to land it in the next release alongside some other changes.

[wyardley]

Thanks all! Cosmetic, I know, but really apreciated!

[threepipes]

@elliotforbes Thank you for merging, and @wyardley Thank you for your assistance!