Refactor list of events on home page and past events page #589
Description
We have a conferences.yml file for each locale that has a lot of duplication and can be tedious to keep up-to-date across all locales.
Instead of using a data file here, we can use Hugo's templating to list the pages. Any data we're missing (e.g. start_date, end_date, etc.) can be introduced as frontmatter params.
By doing this, we don't need any data files and can significantly reduce the amount of manual work required to update these event lists.