Feature: added discord bot with /ping and /sessions command

[yuvrajrathva]

Discord bot command for number of sessions created on that day (From DMP: Goals & Mid-Point Milestone)

• Used discord.js to create a bot
• Implemented /ping command for testing of bot and /sessions command for getting number of sessions created that day
• Used concurrently (a npm package) to run multiple commands using one. Here, command npm run dev used to run both the frontend and the discord bot. This is because Next.js is designed for creating websites, a discord bot requires persistent running, not just on requests.

Please review and suggest any modifications. I am more than happy to make corrections if needed.

[yuvrajrathva]

Resolve Issue #45

Added Loader while session is creating session or while editing session.

• Instant feedback on session actions in form of loader.
• Smooth UI transition during data processing.

Please review and suggest any modifications. I am more than happy to make corrections if needed.