Update README.rst

[jendefig]

Attempting to go off the example in the TPI banner.

I have no idea if I'm doing the path right. I submitted the image for the banner in this PR

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[shcheklein]

Tbh, I think people didn't want to have a banner (to save more space).

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 87.26%. Comparing base (f19095b) to head (60f69cf).

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```diff @@ Coverage Diff @@ ## main #401 +/- ## ======================================= Coverage 87.26% 87.26% ======================================= Files 93 93 Lines 10029 10029 Branches 2046 2046 ======================================= Hits 8752 8752 Misses 919 919 Partials 358 358 ``` | [Flag](https://app.codecov.io/gh/iterative/datachain/pull/401/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=iterative) | Coverage Δ | | |---|---|---| | [datachain](https://app.codecov.io/gh/iterative/datachain/pull/401/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=iterative) | `87.21% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=iterative#carryforward-flags-in-the-pull-request-comment) to find out more.

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[djsauble]

@jendefig I opened a separate PR which updates the logo in both the README and docs, so in theory it could supersede this one.

@shcheklein I understand wanting to save space, but I do think a (small) logo at the top would be a useful way to orient people. How do you feel about this presentation? This replaces the "AI 🔗 DataChain" header from the old README, so it doesn't take up too much more space than before.

Before:

After:

[jendefig]

Closing. Replaced with PR 402