Improve consistency and readability in Quick Start section

[Tinklle-Ambavi]

I noticed that the "A typical quick start guide would have the following sections" part of the README has some inconsistencies in formatting and phrasing.

Some headings use hyphens while others could be standardized for better readability. Improving consistency across these items could make the document clearer for new contributors.

I would be happy to help refine this further if needed.

[goneall]

Thanks @Tinklle-Ambavi for the improvements.

I already merged the grammar fixes (since I think I was the original author).

@zvr @bobmartin3000 @podence - Since I'm not as active in the outreach team, I'll leave the review of the other PR to you