docs: fix removed assets in PR #379 affecting README.md

[jonigl]

Description

Hi there! Hey awesome project guys 🎉 , thanks for pushing the boundaries on this kind of apps for the open source community!

I am just adding a super tiny contribution here. I've just found your project and saw there were some missing images on the README.md, I reviewed what lead to this and found that on yesterday's refactor some assets were gone leaving the README.md without the app logo and app screenshot. This change only adds back the two (still in use) missing images.

• Logo (docs/assets/hero.svg) was removed here https://github.com/lfnovo/open-notebook/pull/379/changes#diff-d472492a5896adbbaf42d18a8ec30330312057554c088ec96d92846f52aeae8b and is still in use in the README.md here https://github.com/lfnovo/open-notebook/blob/main/README.md?plain=1#L14

• Screenshot (docs/assets/asset_list.png) was removed here https://github.com/lfnovo/open-notebook/pull/379/changes#diff-2e72d16dfe62b2e2a3c8740a8aff44744720a21879e5e696c57a2ebe6fce5bd7 and is still in use in the README.md here https://github.com/lfnovo/open-notebook/blob/main/README.md?plain=1#L55

Greetings! 🙌

Related PR

#379

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Code refactoring (no functional changes)
• Performance improvement
• Test coverage improvement

How Has This Been Tested?

Don't apply but tested it in markdown preview

Screenshots

[cubic-dev-ai]

No issues found across 2 files