docs: Upload Strata logo (#7)

# Documentation Pull Request Template

## Description

We need the logo to be stored on a public URL so that wallets can fetch
and load the logo when displaying network details.

---

## Type of Change

- [ ] New Document
- [ ] Update to Existing Document
- [ ] Bug Fix
- [ ] Question/clarification
- [x] Other (please describe): image upload

---

## Checklist

- [x] I have reviewed the existing documentation to avoid duplication.
- [x] The new or updated document includes clear and concise
information.
- [x] All relevant sections (e.g., introduction, usage examples,
references)
      are included.
- [x] The document follows the project's style guide and formatting
rules.
- [x] I have included any necessary references or external resources.
- [x] Spellcheck and grammar check have been performed.
- [ ] (For updates) I have verified that the changes reflect the current
state
      of the project.

---

## Reviewer Checklist

- [x] The purpose and scope of the document are clear.
- [x] The document is easy to understand and follow.
- [x] There are no typos or grammatical errors.
- [x] All necessary sections are included and well-structured.
- [x] The document is consistent with the project's style guide.
- [x] Any referenced links or resources are valid and appropriate.

---

**Thank you for contributing to our documentation!**