feat(layout): add Ergopti (@adrienm7) (monkeytypegame#6352)

### Description

This pull request adds the [Ergopti keyboard
layout](https://ergopti.fr).

### Checks

- [ ] Adding quotes?
- [ ] Make sure to include translations for the quotes in the
description (or another comment) so we can verify their content.
- [ ] Adding a language or a theme?
- [ ] If is a language, did you edit `_list.json`, `_groups.json` and
add `languages.json`?
  - [ ] If is a theme, did you add the theme.css?
- Also please add a screenshot of the theme, it would be extra awesome
if you do so!
- [x] Check if any open issues are related to this PR; if so, be sure to
tag them below.
- [x] Make sure the PR title follows the Conventional Commits standard.
(https://www.conventionalcommits.org for more info)
- [x] Make sure to include your GitHub username prefixed with @ inside
parentheses at the end of the PR title.

Author: adrienm7

frontend/static/layouts/_list.json

@@ -2267,7 +2267,7 @@
       "row5": [" "]
     }
   },
-    "panini_wide": {
+  "panini_wide": {
     "keymapShowTopRow": false,
     "type": "ansi",
     "keys": {
@@ -2277,5 +2277,16 @@
       "row4": ["zZ", "xX", "dD", "gG", "qQ", "/?", "mM", "hH", "'\"", ";:"],
       "row5": [" "]
     }
+  },
+  "ergopti": {
+    "keymapShowTopRow": false,
+    "type": "iso",
+    "keys": {
+      "row1": ["=+", "11", "22", "33", "44", "55", "66", "77", "88", "99", "0º", "€£", "%‰"],
+      "row2": ["èÈ", "yY", "oO", "wW", "bB", "fF", "gG", "hH", "cC", "xX", "zZ", "çÇ"],
+      "row3": ["aA", "iI", "eE", "uU", ".:", "vV", "sS", "nN", "tT", "rR", "qQ", "^!"],
+      "row4": ["êÊ", "éÉ", "àÀ", "jJ", ",;", "kK", "mM", "dD", "lL", "pP", "'?"],
+      "row5": [" -"]
+    }
   }
 }