Add 3 file-finder-related features (#2825)

Co-authored-by: Federico Brigante <opensource@bfred.it>

Author: danedavid

source/index.ts

@@ -345,6 +345,12 @@ export const _isSingleFile = [
 	'https://github.com/sindresorhus/refined-github/blob/fix-narrow-diff/distribution/content.css',
 	'https://github.com/sindresorhus/refined-github/blob/master/edit.txt'
 ];
+
+export const isFileFinder = (): boolean => /^find\//.test(getRepoPath()!);
+export const _isFileFinder = [
+	'https://github.com/sindresorhus/refined-github/find/master'
+];
+
 export const isSingleGist = (): boolean => isGist() && /^\/(gist\/)?[^/]+\/[0-9a-f]{32}$/.test(location.pathname);
 export const _isSingleGist = [
 	'https://gist.github.com/sindresorhus/0ea3c2845718a0a0f0beb579ff14f064'