Ignore several directories and files only in the root of the repo

These directories are always located in the root directory of the repository. Therefore it's better to only ignore these files in this location.

.gitignore

@@ -1,17 +1,17 @@
 *.so
 *.pyc
 *.pyo
-tags
+/tags
 /build
-linux-package
-kitty.app
-compile_commands.json
-link_commands.json
-glad/out
-kitty/launcher
-*.dSYM
+/linux-package
+/kitty.app
+/compile_commands.json
+/link_commands.json
+/glad/out
+/kitty/launcher
+/*.dSYM
 __pycache__
-glfw/wayland-*-client-protocol.[ch]
-docs/_build
-docs/generated
+/glfw/wayland-*-client-protocol.[ch]
+/docs/_build
+/docs/generated
 .DS_Store