Fix upcoming study session

[itayf9]

I've redisigned the upcoming study session area.

• The UI is cleaner
• Added a counter for the number of day away from that session
• Prepared the structure for passing the color of the event of the session (will be implemented in the future). The object upComingStudySession will contain a field called colorHexValue which will be a string of the format "#aaaaaa". If the field is not included, the default color of the line in the UI is the PlanIT blue.
• Added the ".env" file to gitignore

Before:

After:

closes #52

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Name	Status	Preview	Updated (UTC)
plan-it-web	✅ Ready (Inspect)	Visit Preview	Jul 30, 2023 11:07pm