delete .projectile and .dir-locals.el

.gitignore

@@ -2,6 +2,8 @@ ex*-c
 aoc-c
 core*
 .ccls*
+.projectile
+.dir-locals.el
 gmon.out
 *.o
 ex*-cob

2021/.dir-locals.el

@@ -1,4 +0,0 @@
-((nil . ((eval . (let ((root (expand-file-name (projectile-project-root))))
-                   (setq-local
-                    flycheck-gcc-include-path (list (concat root "include"))
-                    compile-command (concat "make -C " root " all")))))))