enhance the sidebar and toggle button in oppurtunities page

[tushar-agarwal7]

Description

In this pull request, I have enhanced the sidebar and toggle button on the Opportunities page. These improvements aim to improve user navigation and overall experience on the page.

Related Issues

fixes: #196 #197

Changes Proposed

i enhance the sidebar, add animations and in oppurtunities page i add theme toggle button

Checklist

• I have read and followed the Contribution Guidelines.
• All new and existing tests passed.
• I have updated the documentation to reflect the changes I've made.
• My code follows the code style of this project.
• The title of my pull request is a short description of the requested changes.

Screenshots

oppurtunities page

Note to reviewers

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[codeaashu]

amazing work tushar
but before merge this

join the whatsapp community we want some changes in this
https://chat.whatsapp.com/Dcl21sgGDIpHURESSuH0p4

[tushar-agarwal7]

@codeaashu done

[tushar-agarwal7]

@codeaashu I have joined the community as suggested. Could you please review and merge my PR #208 at your earliest convenience?