Use Discord Credentials when available

[KarthikRaju391]

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This is related to issue #105

• Added Development setup for discord section in the documentation
• Updated UserMenu.tsx to use discord credentials when available
• Updated the next.config.js file to allow discord avatars to be used in the Image tag

[KarthikRaju391]

Thank you so much for helping me throughout @yk and @fozziethebeat Will be looking forward to contributing more!

[fozziethebeat]

Thank you for working on this and working through the git changes.

[KarthikRaju391]

@fozziethebeat, it was great working on this! Certainly wouldn't be able to do it without your help.