Pastevents Section added.

[Sahilbal]

Related Issue

• Create the Past Event Section #14

Proposed Changes

• index.html for past events section added.
• styles.css for past events section added.
• -images for past events section added.

Checklist

• Documentation of the code
• Add your name to the CONTRIBUTORS file
• Testing your code in the local machine

Screenshots

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[Debdeep1]

LGTM! Thanks for making a PR.

[Sahilbal]

@Debdeep1 is my work fine? kindly comment about this as I am a fresher your review means a lot to me. Also this is my first contribution in open source.