don't set theme-color until we know for sure what the resolvedTheme is

lib/config.js

@@ -18,8 +18,11 @@ module.exports = {
   fathomSiteId: "WBGNQUKW",
   fathomCustomDomain: "https://blue-chilly.jarv.is",
   webmentionId: "jarv.is",
-  themeColorLight: "#fcfcfc",
-  themeColorDark: "#252525",
+  themeColors: {
+    // used for `<meta name="theme-color" ...>`, should be the same as CSS `--background-outer` var in styles/colors.css
+    light: "#fcfcfc",
+    dark: "#252525",
+  },
 
   // Me info
   authorName: "Jake Jarvis",