docs: Update marketing docs

[syedjawadakhtar]

Checklist

• [x] Updates #31
• [x] Passes Semantic Pull Request and TypoCheck
• [ ] New docs are listed in README.md
• [x] New static folder in marketing docs
• [ ] New docs are listed in index.md
• [ ] Updated table of content
• [x] Updated nav links in mkdocs.yml

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PR description

1. Add images to sponsorship.md
2. Add offline_CF.md
3. Add online_CF.md
4. Add static folder with images

[pnijhara]

Looks Good to me! Please add these files in the respective README.

[syedjawadakhtar]

They are meant to be navigated through the sponsorship.md only. Adding in README.md would just cramp the Table of contents.

[pnijhara]

Then how will the reader navigate through these files? Add sub points in the table content under sponsorship point. The links should be added to the navigation bar as well.

[syedjawadakhtar]

Thanks for pointing out that to me.