Refactor subscribe.css to SCSS

[rohitsrma]

Description

This PR fixes a part of #896

Notes for Reviewers

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[leecalcote]

Thanks for contributing, @rohitsrma.

Are these two lines intentional?

[rohitsrma]

Yes, it tells Jekyll to process the file.

https://jekyllrb.com/docs/step-by-step/07-assets/

[Ashparshp]

@rohitsrma, Thanks for your contribution, let's discuss this on the website's call. Please add this as an agenda item to the meeting minutes.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale]

This issue is being automatically closed due to inactivity. However, you may choose to reopen this issue.

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Checking in... it has been awhile since we've heard from you on this issue. Are you still working on it? Please let us know and please don't hesitate to contact a MeshMate or any other community member for assistance.

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