docs: review the NPM package configuration

Perhaps irrelevant since this may never be published publicly as a package,
but it's good practice nonetheless and may help with SEO.

package.json

@@ -1,6 +1,15 @@
 {
-  "name": "mieux-voter",
+  "name": "mieux-voter-openapi",
   "version": "1.0.0",
+  "description": "OpenAPI specifications for a Majority Judgment polling application made by MieuxVoter.fr",
+  "keywords": ["majority", "judgment", "poll", "polling", "api", "rest", "openapi", "democracy", "vote", "libre", "open"],
+  "homepage": "https://github.com/MieuxVoter/mv-api-spec",
+  "bugs": "https://github.com/MieuxVoter/mv-api-spec/issues",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/MieuxVoter/mv-api-spec.git"
+  },
+  "license": "MIT",
   "dependencies": {
     "@redocly/openapi-cli": "^0.12.10"
   },