Update readme, new blurb

README.md

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     <strong>Note: this is the v3 branch, which is currently in beta. <a href="https://docs.pyinfra.com/en/next">See the docs for v3</a>. If needed the <a href="https://github.com/pyinfra-dev/pyinfra/tree/2.x/">2.x branch is here</a>, but is in bugfix only mode.</strong>
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-    <em>pyinfra automates infrastructure using Python. It’s fast and scales from one server to thousands. Great for ad-hoc command execution, service deployment, configuration management and more.</em>
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+    pyinfra turns Python code into shell commands and runs them on your servers. Execute ad-hoc commands and write declarative operations. Target SSH servers, local machine and Docker containers. Fast and scales from one server to thousands. Think <code>ansible</code> but Python instead of YAML, and a lot faster.
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     <a href="https://docs.pyinfra.com"><strong>Documentation</strong></a> &rArr;
     <a href="https://docs.pyinfra.com/page/getting-started.html"><strong>Getting Started</strong></a> &bull;
     <a href="https://docs.pyinfra.com/page/examples.html"><strong>Examples</strong></a> &bull;
     <a href="https://docs.pyinfra.com/page/support.html"><strong>Help & Support</strong></a> &bull;
     <a href="https://docs.pyinfra.com/page/contributing.html"><strong>Contributing</strong></a>
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     Chat &rArr;
     <a href="https://matrix.to/#/#pyinfra:matrix.org"><strong><code>#pyinfra</code> on Matrix</strong></a>
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