Reduce list of root files projectile searches for

And define them on a per-module basis. This reduces the number of file
checks it performs, particularly for non-project files.

Might help #1317

modules/lang/clojure/config.el

@@ -1,5 +1,12 @@
 ;;; lang/clojure/config.el -*- lexical-binding: t; -*-
 
+(after! projectile
+  (pushnew! projectile-project-root-files "project.clj" "build.boot" "deps.edn"))
+
+
+;;
+;;; Packages
+
 ;;;###package clojure-mode
 (add-hook 'clojure-mode-hook #'rainbow-delimiters-mode)