Including Next steps in README.md

### Where should the content be added?

https://github.com/conda-forge/conda-forge.github.io/blob/main/README.md

### What should be added?

After running `make html` command it is not mentioned what the next step is.

For beginners, they might get confused on how to set up documentation web page locally so I think we should steps like how to locally host (XAMPP for eg) and view pages in browser.

### Additional information

_No response_