refactor .js files to ES modules where possible

lib/config/index.js

@@ -1,6 +1,6 @@
 // @ts-check
-// do not convert to ESM and/or TS -- this needs to be imported in CJS files like next.config.js too
-module.exports = {
+
+const config = {
   // Site info
   siteName: "Jake Jarvis",
   siteDomain: "jarv.is",
@@ -17,8 +17,6 @@ module.exports = {
   githubRepo: "jakejarvis/jarv.is",
   verifyGoogle: "qQhmLTwjNWYgQ7W42nSTq63xIrTch13X_11mmxBE9zk",
   verifyBing: "164551986DA47F7F6FC0D21A93FFFCA6",
-  fathomSiteId: "PIUEIVIZ",
-  hcaptchaSiteKey: "60d959de-b01b-4e22-a901-ce395ed086cb",
   giscusConfig: {
     // https://github.com/giscus/giscus-component/tree/main/packages/react#readme
     repo: "jakejarvis/jarv.is",
@@ -41,3 +39,5 @@ module.exports = {
     mastodon: "fediverse.jarv.is/@jake",
   },
 };
+
+export default config;

lib/config/seo.ts

@@ -1,4 +1,4 @@
-import * as config from ".";
+import config from ".";
 import { meJpg, faviconPng, faviconIco, appleTouchIconPng } from "./favicons";
 
 import type { DefaultSeoProps, SocialProfileJsonLdProps, ArticleJsonLdProps } from "next-seo";