Refactor subscribe.css to SCSS

[rohitsrma]

Description

This PR fixes a part of #896

Notes for Reviewers

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[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.

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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[bot]]

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

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