feat(ui): Accommodate early morning, late night, and Saturday classes (Resolves #399)

[adityamkk]

This PR resolves #399
Issue:
The calendar grid does not accommodate for early morning, late night, and Saturday courses, instead dumping them in the Async/Other category in the bottom bar.

Resolving the Issue:
I have redirected early morning, late night, and Saturday courses to the main calendar grid instead of the bottom bar.
I have made the calendar grid flexible: it grows larger to allow for early morning, late night, and Saturday courses, but shrinks back to standard size when the course is removed.

Early Morning Accommodation:

Late Night Accommodation:

Saturday Course Accommodation:

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This change is 

[IsaDavRod]

This PR has some broken results upon opening calendar even while no late, early, or Saturday courses exist, and when they do exist. The height of y-axis hours are also inconsistent sometimes or the y-axis ticks do not align with the grid (this appears on your example screenshots).

Please resolve these issues and I can continue reviewing.