docs: add Overview page and Getting started stubs

docs/docs/2-getting-started/1-installation.md

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+# Installation
+
+Install Uncloud CLI:
+
+```bash
+brew install psviderski/tap/uncloud
+
+# or using curl (macOS/Linux)
+curl -fsS https://get.uncloud.run/install.sh | sh
+```
+
+---
+
+👋 Hey there! This page is still being written. I'm working hard to get all the documentation ready, but there's a lot to
+cover and I want to make sure it's actually helpful rather than rushing it out with LLM slop.
+
+In the meantime, if you need help you have questions, please jump into our
+[Discord server](https://discord.gg/eR35KQJhPu). We're a friendly bunch and always happy to help troubleshoot issues or
+answer questions!
+
+Thanks for your patience as I get the docs into shape.
+
+– Pasha

docs/docs/2-getting-started/2-quick-start.md

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+# Quick start
+
+Please follow the [Quick start](https://github.com/psviderski/uncloud?tab=readme-ov-file#-quick-start) and
+[User guide](https://github.com/psviderski/uncloud/blob/main/docs/user_guide.md) in the README.
+
+---
+
+👋 Hey there! This page is still being written. I'm working hard to get all the documentation ready, but there's a lot to
+cover and I want to make sure it's actually helpful rather than rushing it out with LLM slop.
+
+In the meantime, if you need help you have questions, please jump into our
+[Discord server](https://discord.gg/eR35KQJhPu). We're a friendly bunch and always happy to help troubleshoot issues or
+answer questions!
+
+Thanks for your patience as I get the docs into shape.
+
+– Pasha

docs/docs/2-getting-started/_category_.yaml

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+label: Getting started
+collapsed: false # keep the category open by default
+link:
+  type: generated-index