fix: remove dependency warnings when installing

When installing dependencies it outputs warnings to do with 'unmet peer
dependencies'. Adding them to our own dev dependency list removes this
becuase it is now a direct dependency.

Fixes-issue: #20

package.json

@@ -29,6 +29,8 @@
         "@mdx-js/loader": "^2.1.5",
         "@mdx-js/react": "^2.1.5",
         "@next/mdx": "^13.0.2",
+        "@popperjs/core": "^2.11.6",
+        "@testing-library/dom": ">=7.21.4",
         "@testing-library/jest-dom": "^5.16.5",
         "@testing-library/react": "^13.4.0",
         "@testing-library/user-event": "^14.4.3",
@@ -59,6 +61,5 @@
         "ts-jest": "^29.0.3",
         "ts-node": "^10.9.1",
         "typescript": "^4.9.3"
-    },
-    "dependencies": {}
+    }
 }

yarn.lock

@@ -831,6 +831,11 @@
     "@nodelib/fs.scandir" "2.1.5"
     fastq "^1.6.0"
 
+"@popperjs/core@^2.11.6":
+  version "2.11.6"
+  resolved "https://registry.yarnpkg.com/@popperjs/core/-/core-2.11.6.tgz#cee20bd55e68a1720bdab363ecf0c821ded4cd45"
+  integrity sha512-50/17A98tWUfQ176raKiOGXuYpLyyVMkxxG6oylzL3BPOlA6ADGdK7EYunSa4I064xerltq9TGXs8HmOk5E+vw==
+
 "@rushstack/eslint-patch@^1.1.3":
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/@rushstack/eslint-patch/-/eslint-patch-1.2.0.tgz#8be36a1f66f3265389e90b5f9c9962146758f728"
@@ -862,6 +867,20 @@
   dependencies:
     tslib "^2.4.0"
 
+"@testing-library/dom@>=7.21.4":
+  version "8.19.0"
+  resolved "https://registry.yarnpkg.com/@testing-library/dom/-/dom-8.19.0.tgz#bd3f83c217ebac16694329e413d9ad5fdcfd785f"
+  integrity sha512-6YWYPPpxG3e/xOo6HIWwB/58HukkwIVTOaZ0VwdMVjhRUX/01E4FtQbck9GazOOj7MXHc5RBzMrU86iBJHbI+A==
+  dependencies:
+    "@babel/code-frame" "^7.10.4"
+    "@babel/runtime" "^7.12.5"
+    "@types/aria-query" "^4.2.0"
+    aria-query "^5.0.0"
+    chalk "^4.1.0"
+    dom-accessibility-api "^0.5.9"
+    lz-string "^1.4.4"
+    pretty-format "^27.0.2"
+
 "@testing-library/dom@^8.5.0":
   version "8.18.1"
   resolved "https://registry.yarnpkg.com/@testing-library/dom/-/dom-8.18.1.tgz#80f91be02bc171fe5a3a7003f88207be31ac2cf3"
@@ -2902,14 +2921,7 @@ is-callable@^1.1.4, is-callable@^1.2.7:
   resolved "https://registry.yarnpkg.com/is-callable/-/is-callable-1.2.7.tgz#3bc2a85ea742d9e36205dcacdd72ca1fdc51b055"
   integrity sha512-1BC0BVFhS/p0qtw6enp8e+8OD0UrK0oFLztSjNzhcKA3WDuJxxAPXzPuPtKkjEY9UUoEWlX/8fgKeu2S8i9JTA==
 
-is-core-module@^2.8.1:
-  version "2.11.0"
-  resolved "https://registry.yarnpkg.com/is-core-module/-/is-core-module-2.11.0.tgz#ad4cb3e3863e814523c96f3f58d26cc570ff0144"
-  integrity sha512-RRjxlvLDkD1YJwDbroBHMb+cukurkDWNyHx7D3oNB5x9rb5ogcksMC5wHCadcXoo67gVr/+3GFySh3134zi6rw==
-  dependencies:
-    has "^1.0.3"
-
-is-core-module@^2.9.0:
+is-core-module@^2.8.1, is-core-module@^2.9.0:
   version "2.11.0"
   resolved "https://registry.yarnpkg.com/is-core-module/-/is-core-module-2.11.0.tgz#ad4cb3e3863e814523c96f3f58d26cc570ff0144"
   integrity sha512-RRjxlvLDkD1YJwDbroBHMb+cukurkDWNyHx7D3oNB5x9rb5ogcksMC5wHCadcXoo67gVr/+3GFySh3134zi6rw==