📦 ⬆️ theme: Pull latest upstream commits

This brings in the following changes:

* 🆕 💄 layouts(shortcodes): Create table layout
  (unicef/inventory-hugo-theme#70)
* 🆕 ✨ layouts(shortcodes): Add embed-pdf shortcode
  (unicef/inventory-hugo-theme#56)
* 🐛 layouts(default): Add condition to show "RA Section" when content is available
  (unicef/inventory-hugo-theme#68)
* 💄 assets(css): Make Table of Contents more appealing and responsive
  (unicef/inventory-hugo-theme#73)
* 🐛 assets(css): Fix styling of highlight code blocks
  (unicef/inventory-hugo-theme#72)

Signed-off-by: Justin W. Flory (he/him) [UNICEF Innovation] <[email protected]>