Add page metadata titles to main and availability pages

[seancfong]

Summary

Currently, when visiting the website, it shows up as "create next app". Ideally, change the page title to something like "ZotMeet | Create a Meeting" or similar.

Also, dynamically pull the name of the meeting when visiting /availability/[slug].
Try looking into generateMetadata from Next.JS - https://nextjs.org/docs/app/api-reference/functions/generate-metadata