Update aws-startup-advisor listing description

Refreshes the marketplace listing description for the AWS Startup Advisor
plugin at the maintainer's request.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.claude-plugin/marketplace.json

@@ -420,20 +420,6 @@
       },
       "homepage": "https://docs.bigdata.com"
     },
-    {
-      "name": "bigquery-data-analytics",
-      "description": "Connect, query, and generate data insights for BigQuery datasets and data.",
-      "author": {
-        "name": "Google LLC"
-      },
-      "category": "database",
-      "source": {
-        "source": "url",
-        "url": "https://github.com/gemini-cli-extensions/bigquery-data-analytics.git",
-        "sha": "9cee2a03105d74648231ed3a5c4a63c4f194790d"
-      },
-      "homepage": "https://github.com/gemini-cli-extensions/bigquery-data-analytics"
-    },
     {
       "name": "box",
       "description": "Work with your Box content directly from Claude Code — search files, organize folders, collaborate with your team, and use Box AI to answer questions, summarize documents, and extract data without leaving your workflow.",
@@ -2103,7 +2089,7 @@
         "source": "url",
         "url": "https://github.com/RevenueCat/rc-claude-code-plugin.git",
         "path": "revenuecat",
-        "sha": "b34f9bebe02ceb7e3f32e6d7d081cdfb2e7c37a6"
+        "sha": "81262a339601c4b64b909c370225cbd7917ade1f"
       },
       "homepage": "https://www.revenuecat.com"
     },
@@ -2665,22 +2651,6 @@
       },
       "homepage": "https://github.com/UI5/plugins-coding-agents"
     },
-    {
-      "name": "valtown",
-      "description": "Build and deploy on Val Town. Bundles the Val Town MCP server and platform skills (HTTP vals, cron/intervals, SQLite, email, OAuth, React UI, third-party integrations, templates).",
-      "author": {
-        "name": "Val Town"
-      },
-      "category": "deployment",
-      "source": {
-        "source": "git-subdir",
-        "url": "https://github.com/val-town/plugins.git",
-        "path": "plugin",
-        "ref": "main",
-        "sha": "e01069e11ea6e46b8d2d5fd2945f2dd4d33e6a57"
-      },
-      "homepage": "https://val.town"
-    },
     {
       "name": "vanta",
       "description": "The Vanta plugin connects Claude Code to Vanta's security and compliance platform through the Vanta MCP server. It combines Vanta's test-specific remediation intelligence with your local repository context to help you fix compliance failures faster.",