docs(readme): improve quality

[trueNAHO]

Description

Remove a redundant HTML div tag and improve spacing.

Additional Notes

Anything else you want to add, such as remaining questions or explanations.

Should the text be wrapped at 80 or 72 characters?

Checklist

Please make sure you can check all the boxes that apply to this PR.

• All widgets I've added are correctly documented.
• I added my changes to CHANGELOG.md, if appropriate.
• The documentation in the docs/content/main directory has been adjusted to reflect my changes.
• I used cargo fmt to automatically format all code before committing