docs: fix /explore page links to /hub

[uinstinct]

Description

/explore search results have been migrated to /hub

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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

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Tests

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Summary by cubic

Update docs and CLI links from /explore to /hub so Mission Control pages open correctly after the search results migration. Fixes broken navigation to prompts, rules, models, configs, and MCP servers.

• Bug Fixes
  • Updated doc links to use https://hub.continue.dev/hub for prompts, rules, AskSage, DeepSeek, Gemini, Agent customization, and configs.
  • Updated CLI MCPSelector to open MCP servers at https://hub.continue.dev/hub?type=mcpServers.

^{Written for commit ec96293. Summary will update automatically on new commits.}

[cubic-dev-ai]

No issues found across 8 files

[RomneyDa]

@uinstinct looks like some major conflicts have come up.