fixed img for dark mode

[milinddethe15]

Special notes for your reviewer: fixed issue by adding white bg to png

Checklist:

• [x] Fixes #253
• [x] Signed the commit for DCO to be passed
• [x] Labelled this PR & related issue with documentation tag

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Name	Status	Preview	Comments	Updated (UTC)
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[neelanjan00]

Hi @milinddethe15 can you please close and re-open the PR? Looks like the Github Actions CI step is stuck 😐

[milinddethe15]

@neelanjan00 Done