Make setting availabilities more intuitive

[innopoop]

Features:

1. Add save button for weekly availability
   
2. Changed calendar appearance
3. Make it so that you can toggle between different dates and save / Add manual setting of unavailable
   
   

[vercel]

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🔍 Inspect: https://vercel.com/novaforgood/risc/6Q78vQX2i2D7xD7DaCBHdhC7muFH
✅ Preview: https://risc-git-ashley-multiday-overrides-novaforgood.vercel.app

[nova-admin]

📝Changed routes:

…[profileRoute]/mentees	…[profileRoute]/mentors
(view full size)	(view full size)

/program/[slug]/apply
(view full size)

Commit d68c2c3 (https://risc-kbvgw0loz-novaforgood.vercel.app).