Remove RPi4 and PinebookPro builds (#775)

* Remove RPi4 and PinebookPro builds

Fixes #768

* Delete pinebookpro directory

* Delete .github/workflows/daily-arm.yml

* Delete build-pinebookpro.sh

* Delete build-rpi.sh

* Update README.md

* Update README.md

Author: danirabbit

.github/workflows/daily-arm.yml

@@ -18,8 +18,6 @@
 <p align="center">
   <img src="https://github.com/elementary/os/actions/workflows/stable-8.0.yml/badge.svg" alt="Stable 8.0">
   <img src="https://github.com/elementary/os/actions/workflows/daily-8.0.yml/badge.svg" alt="Daily 8.0">
-  <img src="https://github.com/elementary/os/actions/workflows/daily-arm.yml/badge.svg" alt="Daily ARM">
-
 </p>
 
 ---
@@ -43,28 +41,6 @@ docker run --rm --privileged -it \
     ./build.sh etc/terraform.conf
 ```
 
-### Raspberry Pi 4
-
-```sh
-docker run --rm --privileged -it \
-    -v /proc:/proc \
-    -v ${PWD}:/working_dir \
-    -w /working_dir \
-    ubuntu:24.04 \
-    ./build-rpi.sh
-```
-
-### Pinebook Pro
-
-```sh
-docker run --rm --privileged -it \
-    -v /proc:/proc \
-    -v ${PWD}:/working_dir \
-    -w /working_dir \
-    ubuntu:24.04 \
-    ./build-pinebookpro.sh
-```
-
 ## Further Information
 
 More information about the concepts behind `live-build` and the technical decisions made to arrive at this set of tools to build an .iso can be found [on the wiki](https://github.com/elementary/os/wiki/Building-iso-Images).