feat(layout): add focal (@rbscholtus) (monkeytypegame#6196)

### Description

I discovered a new layout that is gaining some traction on
[/r/KeyboardLayouts](https://www.reddit.com/r/KeyboardLayouts/). It is
listed as an (potential) improvement on Gallium, Sturdy and others on
[getreuer.info](https://getreuer.info/posts/keyboards/alt-layouts/index.html)
and according to my own analysis because:

- low SFBs
- low bad redirects
- low scissors

[Original repo](https://github.com/Keyhabit/Focal-keyboard-layout) is
here.

Author: rbscholtus

frontend/static/layouts/_list.json

@@ -2233,5 +2233,16 @@
       "row4": ["'\"", ".>", ",<", "bB", "xX", "mM", "pP", "qQ", "kK", ";:"],
       "row5": [" "]
     }
+  },
+  "focal": {
+    "keymapShowTopRow": false,
+    "type": "ansi",
+    "keys": {
+      "row1": ["`~", "1!", "2@", "3#", "4$", "5%", "6^", "7&", "8*", "9(", "0)", "-_", "=+"],
+      "row2": ["vV", "lL", "hH", "gG", "kK", "qQ", "fF", "oO", "uU", "jJ", "[{", "]}", "\\|"],
+      "row3": ["sS", "rR", "nN", "tT", "bB", "yY", "cC", "aA", "eE", "iI", "/?"],
+      "row4": ["zZ", "xX", "mM", "dD", "pP", "'\"", "wW", ".>", ";:", ",<"],
+      "row5": [" "]
+    }
   }
 }