fix: enable CCDA documents to be properly searched with semantic search

fix: fix zod validation for config

feat(docs): update marketing site header

fix(app): fix connection cards 'fix' creating a new connection card i…

…nstead of replacing the current one for epic connections

fix: fix mobile menu on marketing page

feat(app): show documents on main timeline, show participants on cards

feat(app): improve empty state if search returns no results

feat(app): refine MereAI to use function calling to explicitly query …

…relevant results instead of proactively attempting to return results based on the initial query

feat(demo): update demo data

feat(app): improve ui of d&d interface and button on summary page