docs: add Vestige to example MCP servers

[samvallad33]

Description

Adds Vestige to the example MCP servers page. It's a local stdio MCP server that gives the agent memory across sessions, so Continue can recall project decisions and past fixes instead of starting cold every time. None of the current examples cover memory, and it comes up a lot, so it earns a spot on the list.

Config uses the same mcpServers shape as the other entries. I ran the exact snippet before submitting: npx -y -p vestige-mcp-server@latest vestige-mcp boots the server and returns a valid response to an MCP initialize call over stdio, so it's copy-paste ready. Also added vestige and memory to the page keywords. Docs only, nothing else touched.

Checklist

• I've read the contributing guide
• The relevant docs, if any, have been updated or created
• The relevant tests, if any, have been updated or created

Tests

Docs only, no tests. Verified the config snippet starts the server and answers an MCP initialize request locally.

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[samvallad33]

I have read the CLA Document and I hereby sign the CLA