Add CFF spotlight (branch)

From !510 (merged).

• revert to actual most recent submodule commits
• check build
• merge

assigned to @jandt-desy

added 5 commits

• 98d18d63 - Update CFF spotlight
• 55945ea9 - Add spotlight text and images
• eeb98861 - Add GitHub screenshot to CFF spotlight page
• cf5ba7fe - Add alt tag to image
• 0008b3cd - add date

Compare with previous version

marked the checklist item revert to actual most recent submodule commits as completed

changed title from Cff spotlight branch to Add CFF spotlight (branch)

marked the checklist item check build as completed

marked the checklist item merge as completed

merged

mentioned in commit 3aad283b