Add Scholar Sidekick tutorial page + anonymous-default auth (v0.8.0) (#9477)

documentation/static/servers.json

@@ -852,14 +852,19 @@
   "description": "Resolve, format, export, and verify academic citations (DOI, PMID, ISBN, arXiv) plus retraction and open-access checks",
   "command": "npx -y scholar-sidekick-mcp@latest",
   "link": "https://github.com/mlava/scholar-sidekick-mcp",
-  "installation_notes": "Requires a free RapidAPI key. Get one at https://rapidapi.com/scholar-sidekick-scholar-sidekick-api/api/scholar-sidekick and set RAPIDAPI_KEY.",
+  "installation_notes": "No API key required — works anonymously on a free, rate-limited tier. Optionally set SCHOLAR_API_KEY (a free first-party ssk_ key from https://scholar-sidekick.com/account) for higher limits, or RAPIDAPI_KEY for paid tiers via RapidAPI.",
   "is_builtin": false,
   "endorsed": false,
   "environmentVariables": [
+    {
+      "name": "SCHOLAR_API_KEY",
+      "description": "Optional first-party API key (ssk_) from https://scholar-sidekick.com/account; raises rate limits. Sent as Authorization: Bearer.",
+      "required": false
+    },
     {
       "name": "RAPIDAPI_KEY",
-      "description": "RapidAPI key for the Scholar Sidekick API (free tier available)",
-      "required": true
+      "description": "Optional RapidAPI key for paid/managed tiers; routes calls through the RapidAPI gateway.",
+      "required": false
     }
   ]
 }