refactor(users/glittershark): Rename to grfn

Rename my //users directory and all places that refer to glittershark to
grfn, including nix references and documentation.

This may require some extra attention inside of gerrit's database after
it lands to allow me to actually push things.

Change-Id: I4728b7ec2c60024392c1c1fa6e0d4a59b3e266fa
Reviewed-on: https://cl.tvl.fyi/c/depot/+/2933
Tested-by: BuildkiteCI
Reviewed-by: tazjin <mail@tazj.in>
Reviewed-by: lukegb <lukegb@tvl.fyi>
Reviewed-by: glittershark <grfn@gws.fyi>

users/grfn/keyboard/increase-tapping-delay.patch

@@ -0,0 +1,13 @@
+diff --git a/keyboards/ergodox_ez/config.h b/keyboards/ergodox_ez/config.h
+index ae70c4f2e..776110c09 100644
+--- a/keyboards/ergodox_ez/config.h
++++ b/keyboards/ergodox_ez/config.h
+@@ -45,7 +45,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ /* define if matrix has ghost */
+ //#define MATRIX_HAS_GHOST
+ 
+-#define TAPPING_TERM    200
++#define TAPPING_TERM    150
+ #define IGNORE_MOD_TAP_INTERRUPT // this makes it possible to do rolling combos (zx) with keys that convert to other keys on hold (z becomes ctrl when you hold it, and when this option isn't enabled, z rapidly followed by x actually sends Ctrl-x. That's bad.)
+ 
+ /* Mechanical locking support. Use KC_LCAP, KC_LNUM or KC_LSCR instead in keymap */