docs: update short guide of dev setup

[brunoffranca]

What ❔

Updates the setup dev guide and turns it into a fully automated script. You just need to run one curl command and everything will be installed with no user input. Also fixed some minor issues with the previous guide:

• Removed the HTTPS configuration for git. Instead uses HTTPS by default since that's Github recommendation.
• Installs git along with the other necessary packages.
• Adds --locked flag to cargo-nextest installation since that's the recommended way.
• Changed installation steps order to make more sense (ex: we were installing curl after using it).
• Included ZK Stack CLI in the installation instead of having it separate.

[brunoffranca]

On the Foundry-zksync install script, we probably need to add . "$SHELL_CONFIG_FILE" after echo "Installation completed successfully!" since the verification afterwards fails (running source ~/.bashrc solved it on my machine).

Update: Replacing if forge --version | grep -q "0.0.2" with if "$HOME/.foundry/bin/forge" --version | grep -q "0.0.2" should do the trick.

Update: I'm waiting for write permissions to add this fix. It doesn't impact this PR though.

[brunoffranca]

Weird. When running zkstack dev fmt or zkstack dev lint after this installation, it complains that Prettier is not installed. But I can check that it is.