[REQ] Improve readme in structure and content

Is your feature request related to a problem? Please describe.

The readme seems convoluted with a lot of information "noise". This includes:

• redirecting paragraphs (e.g. section 3.1)
• not directly project related information (Sponsors, Presentations, Contributors)
• redundancy (e.g. section 2 & 3.0.) and general structuring (TOC at 3rd position, relevant sections are 1, 3 & 7 )

On the other hand a list (or reference to) with the actual generators is missing. ( e.g. a link to https://openapi-generator.tech/docs/generators)

This makes ist hard for people with disabilities to grasp the project as a TOOL!

Describe the solution you'd like and alternatives

Restructure readme by moving the "noise" to dedicated files and link them directly from the TOC.

However I understand the need for the billboard style in a sponsored and voluntary ❤️ project.
Thus my alternative suggestion would be to move the actual installing and usage into a dedicated quick-start-manual-file. (e.g. by prominently linking to https://openapi-generator.tech/docs/installation or a readme within the docs folder)

Additional context

if you need a feel for how this looks to e.g. dyslexic people, then add a "the" after every other (or 3rd) word and subject the result to an automatic double translation (forward & backward).
It might not be exactly what I am experiencing reading that "readme" but it might give an idea.

Thank You for Your consideration

Start by reviewing the repository README and the linked docs/installation and generators pages to map the current sections, redundancies, and missing generator reference. Done means the README has a clearer structure for accessibility, with unrelated material moved or linked appropriately and installation, usage, and generator information easy to find.