[docs] Improve Quickstart with examples and fix 'What’s next?' links#1734

Dhiraj309 wants to merge 5 commits intobitsandbytes-foundation:mainbitsandbytes-foundation/bitsandbytes:mainfrom

Dhiraj309:docs/quickstart-updateDhiraj309/bitsandbytes:docs/quickstart-updateCopy head branch name to clipboard