docs(fonts): specify host installation

resolves #5284

website/docs/installation/fonts.mdx

@@ -12,6 +12,12 @@ import TabItem from "@theme/TabItem";
 Oh My Posh was designed to use [Nerd Fonts][nerdfonts]. Nerd Fonts are popular fonts that are patched to include icons.
 To see the icons displayed in Oh My Posh, **install** a [Nerd Font][nerdfonts], and **configure** your terminal to use it.
 
+:::info
+Fonts need to be installed on the host system as this is a UI setting, not a command line, or shell configuration.
+This means **when running inside a container or WSL**, you need to install the font on the host system and configure
+your terminal emulator to use it.
+:::
+
 ### Installation
 
 <Tabs