docs: adjust branding usage (#3550)

docs/content/en/reference/guides/branding.md

@@ -15,14 +15,28 @@ toc: true
 ## Usage
 
 The images are currently licensed under the same [Apache 2.0](https://github.com/authelia/authelia/blob/master/LICENSE)
-as everything else in the repository. It is requested however that with all of our branding that the only modifications
-made to it are related to layout. Examples of layout changes include:
+as everything else in the repository. It is kindly requested however that with all of our branding that users only make
+modifications that are in harmony with the following rules which are not intended to restrict usage unreasonably and are
+only intended to preserve the Authelia branding identity:
+
+1. They do not unreasonably alter the quality of the branding:
+   - Image size changes should be done only when the size is appropriate for the intended display scenario.
+   - Compression should not be applied overly aggressively for the intended display scenario.
+2. The changes do not unreasonably alter the design of the branding and should fit one or more of the following
+   categories:
+   - Layout
+   - Format
+
+Examples of changes which fit these categories include:
 
 - Adjusting the Spacing Around Images
 - Adjusting the Size of the Images
+- Saving the Images in Another Format
+- Saving the Images with a Different Compression
 
 If you have a particular adjustment you'd like to make that does not fit within these categories we kindly request that
-you discuss it with the team in advance.
+you discuss it with the team in advance. It is likely that all reasonable requests will be added to this list in some
+way.
 
 ## Location