Add news bullet

NEWS.md

@@ -1,5 +1,6 @@
 # pkgdown (development version)
 
+* `build_home_index()` now renders Math if you use it in your home page (#2263).
 * `build_articles()` now reports if you are missing alt-text for any images (#2357).
 * `check_pkgdown()` and `pkgdown_sitrep()` have been unified so that they both report on the same problems. They now only differ in the style of their output: `pkgdown_sitrep()` reports whether each category is ok or not ok, while `check_pkgdown()` errors on the first issue (#2463).
 * `build_site()` automatically runs `pkgdown_sitrep()` at the start of the process (#2380).