add note about ~/.atuin

Author: ellie

src/content/docs/guide/installation.mdx

@@ -8,9 +8,10 @@ import {Aside, Tabs, TabItem, LinkCard} from "@astrojs/starlight/components";
 
 Let's get started! First up, you will want to install Atuin. The recommended
 approach is to use the installation script, which automatically handles the
-installation of Atuin including the requirements for your environment. It will
-do its best to use your system package manager wherever possible, and will
-fallback to installing a binary to `~/.atuin/bin` where this is not possible.
+installation of Atuin including the requirements for your environment. 
+
+It will install a binary to `~/.atuin/bin`, and if you'd rather do something else 
+then the manual steps below offer much more flexibility.
 
 <Tabs>
   <TabItem label="bash/zsh">