refactor: Update coverage ignore paths after moving files into /site (#139)

Unfortunately along with #133 I missed one other item in moving files to `/site` in #128 - ignoring new configuration files (and other folders) in our `jest.config.js`.

This caused our coverage numbers in front-end code to dip, because files that shouldn't be included (and previously weren't included) were now being tracked for coverage.

site/jest.config.js

@@ -31,9 +31,13 @@ module.exports = {
     "<rootDir>/**/*.ts",
     "<rootDir>/**/*.tsx",
     "!<rootDir>/**/*.stories.tsx",
+    "!<rootDir>/_jest/**/*.*",
     "!<rootDir>/.next/**/*.*",
     "!<rootDir>/api.ts",
+    "!<rootDir>/coverage/**/*.*",
     "!<rootDir>/dev.ts",
+    "!<rootDir>/jest-runner.eslint.config.js",
+    "!<rootDir>/jest.config.js",
     "!<rootDir>/next-env.d.ts",
     "!<rootDir>/next.config.js",
     "!<rootDir>/out/**/*.*",