add python installation instructions

[blole]

this was the command I had to run to install python on a new computer :slightly_smiling_face:

Summary by CodeRabbit

• Documentation
  • Updated the installation instructions for Docker to improve user setup experience.
  • Added installation steps for Python 3.10, including necessary development files and pip packages.

[coderabbitai[bot]]

Walkthrough

The recent update simplifies the Docker installation process by allowing users to add themselves to the Docker group automatically. It also modernizes the Python setup by providing instructions to install Python 3.10, including necessary development files, documentation, and pip packages.

Changes

File	Change Summary
README.md	Updated Docker installation to use $(whoami) for user addition; added Python 3.10 installation steps including dev files, docs, and pip.

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[emanuelen5]

We are using Python 3.11 in the Docker image though: https://github.com/makerspace/makeradmin/blob/master/api%2FDockerfile#L1

So the installation instruction should preferably be updated to 3.11 as well.