Lay out custom theme and docs

README.md

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 > [login.lumbung.space](https://login.lumbung.space)
 
 [Custom theming](https://www.keycloak.org/docs/latest/server_development/index.html#_themes) for the Keycloak SSO service.
+
+Please see [default-themes/README.md](./default-themes/README.md) and [lumbung.space/README.md](./lumbung.space/README.md) for more info.

default-themes/README.md

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+# default-themes
+
+The keycloak documentation says that it is not recommended to modify existing themes. Therefore, we include these files here as a copy/pasta of [those existing themes in the Keycloak github repository](https://github.com/keycloak/keycloak/tree/master/themes/src/main/resources/theme) for the purpose of copying over to a custom theme. If you want to make theme changes, please make them in the [lumbung.space](../lumbung.space) folder.