Redesign conference form with improved UI organization

• Group form into logical sections with background color and headers
• Add labels and placeholder text

enabled an automatic merge when all merge checks for a222d1e6 pass

aborted the automatic merge because target branch was updated

added 3 commits

• a222d1e6...3e9e53b7 - 2 commits from branch main
• 3eb8e759 - Redesign conference form with improved UI organization

Compare with previous version

enabled an automatic merge when all merge checks for 3eb8e759 pass

merged

mentioned in commit dac40a12