Markdown rendering on homepage

[ljcamargo]

In this pull request, I have addressed the issue by ensuring that LaTeX is properly rendered in the descriptions of featured tasks item listing on the homepage as it happens on other sections. Specifically, any text elements surrounded by the $ delimiters are now correctly processed and displayed as LaTeX. [Unitary Hack 2024]

[vprusso]

Nice job, @ljcamargo

This looks good on my end, but I'll page @WrathfulSpatula to see if there are any other areas on Metriq that could use a similar update. Nice work!