Update README.md (#49632)

* Removed 4.0 branding
* Updated URL

![Screen Recording 2023-03-17 at 01 26 08
PM](https://user-images.githubusercontent.com/398230/226031341-5cb9cec0-1193-4b7e-9603-175ce283f02b.gif)


## Test plan

<!-- All pull requests REQUIRE a test plan:
https://docs.sourcegraph.com/dev/background-information/testing_principles
-->
* Test URL
* Test dark/light mode
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Justin Dorfman 2023-03-17 13:28:21 -07:00 committed by GitHub
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@ -1,9 +1,10 @@
<a href="https://about.sourcegraph.com/sourcegraph-4" target="_blank">
<picture>
<source srcset="https://p21.p4.n0.cdn.getcloudapp.com/items/xQuxo7AA/a9e1873b-c7b2-4295-b96a-dd21c992eb63.svg" media="(prefers-color-scheme: dark)">
<img src="https://p21.p4.n0.cdn.getcloudapp.com/items/ApuDmzGr/822118fe-e5e6-4f37-8c17-8b406437ad03.svg" alt="Sourcegraph 4.0" width="100%">
</picture>
</a>
<p align="center">
<a href="https://about.sourcegraph.com/" target="_blank">
<picture>
<source media="(prefers-color-scheme: dark)" srcset="https://p21.p4.n0.cdn.getcloudapp.com/items/6qub2y6g/8c25cf68-2715-4f0e-9de6-26292fad604f.svg" width="50%">
<img src="https://p21.p4.n0.cdn.getcloudapp.com/items/12u7NWXL/5e21725d-6e84-4ccd-8300-27bf9a050416.svg" width="50%">
</picture></a>
</p>
<p align="center">
<a href="https://docs.sourcegraph.com">Docs</a>