Merge pull request #164 from basecamp/app-boot-hook-files

Add missing files

Author: djmb

docs/hooks/post-app-boot.md

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+---
+title: post-app-boot
+---
+
+# Hooks: post-app-boot
+
+Run after booting the app container when you call `kamal app boot`, or indirectly via `kamal deploy`.
+
+See [pre-app-boot](../pre-app-boot) for more information.

docs/hooks/pre-app-boot.md

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+---
+title: pre-app-boot
+---
+
+# Hooks: pre-app-boot
+
+Run before booting the app container when you call `kamal app boot`, or indirectly via `kamal deploy`.
+
+With a grouped boot strategy, the hook will be called once for each group, with `KAMAL_HOSTS` containing a list of servers in the group.
+
+The [post-app-boot](../post-app-boot) will be called after the boot completes, again once per deployment group.