Update README to Allow Install and Run Commands to Be Copied As Is

[pollyandhiscat]

The current version of the README contains extra text that make commands fail.

Example:

But if we use the command as is, we get an error:

My humble proposal is to align the README with other parts of the README, which adopts a similar format (without the dollar sign and output as part of the command text).

Here is an example currently in the README, at the bottom:

Additionally, this format is good as it aligns with other documentation formats, such as that used by GitHub. Here is an example from the GitHub docs on generating new SSH keys:

[tiangolo]

📝 Docs preview for commit ea2b0b1 at: https://5e1c09ff.fastapitiangolo.pages.dev

[tiangolo]

Thanks for the interest! This is because the README is more or less a copy of the markdown in the docs: https://fastapi.tiangolo.com/

Those commands are shown in a mini-animated terminal there. 🤓

So, I'll pass on this one, but thanks for the effort. ☕