Changelog: November's site updates

We're making ongoing technical and usability improvements to the Civic Tech Field Guide. These are always available on our site changelog. You can also stay up to date on the most recently added project listings at civictech.guide/new. November site updates:

• The NYC page's map now begins focused on NYC, rather than zoomed out
• We've extended grayed-out background shading to Graveyard entries site-wide, so users can easily distinguish live projects from dead ones.
• Created a Govtech table of contents page with more category descriptions
• Improved the homepage world map on mobile to show more than 2 aggregated pin bubbles
• Upgraded site to PHP 7.3, the latest and most performant version of PHP
• Updated to WordPress 5.3
• Optimized CSS, HTML, and Javascript to improve page speed (reduced 44 CSS files to 4)
• Created a High-tech civic tech table of contents page with category descriptions
• Fixed line spacing on lists to match normal copy
• Expanded the "Shows" category to "Shows and films"