Change hover image for social login in guides page

[nkshah2]

Summary of change

• Changes the image that appears when social login on the guides page is hovered

Related issues

Checklist

• [ ] Algolia search needs to be updated? (If there is a new sub docs project, then yes)
• [ ] Sitemap needs to be updated? (If there is a new sub docs project, then yes)
• [x] Checked for broken links? (Run cd v2 && MODE=production npx docusaurus build)
• [ ] Changes required to the demo apps corresponding to the docs?

Remaining TODOs for this PR

• [ ] ...

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