Updated README (#22)

* Reordered README.md and added docker pull examples.

* Formatted markdown.

README.md

@@ -4,29 +4,21 @@
 
 Images can be found on [DockerHub](https://hub.docker.com/r/mglolenstine/gtk4-cross/tags) or [GitHub container repository](https://github.com/MGlolenstine/gtk4-cross/pkgs/container/gtk4-cross).
 
-## Image building
+### To pull from DockerHub
 
-To create required images, clone the repository and cd into the root.
+Example for GTK 4.6:
 
-To build any images other than the base one, you will need to have prebuilt the base image.
+```bash
+docker pull mglolenstine/gtk4-cross:rust-gtk-4.6 
+```
 
-### Build script
+### To pull from GitHub container repository
 
-There's a file `build_image.sh` present in the root of the repository.
-It takes environment variables and one cmdline argument to build the image you want.
+Example for GTK 4.6:
 
-|ENV|Default|Description|
-|---|---|---|
-|GTK|"main"|GTK version to be built|
-|ADW|"main"|ADW version to be built|
-|BASE|"gtk4-cross-base-$GTK-$ADW"|Base image name for Docker, only used on images built on top of the base image|
-|TAG|"$IMAGE-$GTK-$ADW"|A name set for the output image|
-
-The script takes one argument, which can be
-|Argument|Description|
-|---|---|
-|`base`|Which builds the base image.|
-|`rust`|Which builds the rust image.|
+```bash
+docker pull ghcr.io/mglolenstine/gtk4-cross:rust-gtk-4.6 
+```
 
 ## Cross compilation
 
@@ -48,6 +40,30 @@ Then run `build` to build the project and `package` to package it into a zip fil
 
 `package.zip` will be present in your project directory.
 
+## Image building
+
+To create required images, clone the repository and cd into the root.
+
+To build any images other than the base one, you will need to have prebuilt the base image.
+
+### Build script
+
+There's a file `build_image.sh` present in the root of the repository.
+It takes environment variables and one cmdline argument to build the image you want.
+
+|ENV|Default|Description|
+|---|---|---|
+|GTK|"main"|GTK version to be built|
+|ADW|"main"|ADW version to be built|
+|BASE|"gtk4-cross-base-$GTK-$ADW"|Base image name for Docker, only used on images built on top of the base image|
+|TAG|"$IMAGE-$GTK-$ADW"|A name set for the output image|
+
+The script takes one argument, which can be
+|Argument|Description|
+|---|---|
+|`base`|Which builds the base image.|
+|`rust`|Which builds the rust image.|
+
 ## Image creation
 
 If you want to create your own project builder