Add Inkeep to docs

integrations/inkeep.mdx

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+title: "Inkeep"
+---
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+We’ve partnered with Inkeep to make Keep, Inkeep’s copilot for support, available via API in your Plain workspace. 
+
+Keep's Smart Assist mode analyzes the thread you're currently looking at to generate intelligent suggestions to move the conversation forward.
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+Suggestions can include:
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+1. Draft Answers: Editable responses that are likely to resolve the issue.
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+2. Quick Links: Relevant sources for the issue, such as docs, previous support requests, and Slack threads.
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+3. Summaries & To-Do's: Summaries of long conversations and actionable remaining to-dos.
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+4. Other: Quick replies, sentiment analysis, and other helpful insights.
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+Keep is fully conversational - you can ask for clarifications or even request modifications to suggested answers.
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+Check out [Inkeep’s docs](https://docs.inkeep.com/support-tools/agent-copilot/plain) for full setup instructions.