Improve front page with 'Features' and more 'highlights'

added 15 commits

• 1fdc5598...1021b1a6 - 14 commits from branch main
• aae340f9 - Merge remote-tracking branch 'origin/main' into improve-docs-chep

Compare with previous version

merged

@rbianchi: do we need to keep the branch of this MR around? Thanks