Update README.md (#48717)
## Improving Documentation
### The following changes have been made to the official repository's
**Readme.md**:
- Shortened link text across the readme.
- Added additional descriptions for more details.
- Added bold text to highlight emphasis on important topics
- Changed heading sizes to indicate first headings (h1) for each section
instead of second headings (h2) which was previously being used
- Merged _'Who is using Next.js?'_ section with _'Getting Started'_
section for a more professional, cleaner look.
### The following changes have been made to the repository's
**Contribution docs**:
- Fixed two typos in the docs
---------
Co-authored-by: Sam Ko <sam@vercel.com>
Co-authored-by: Delba de Oliveira <32464864+delbaoliveira@users.noreply.github.com>
