Build System Image

**Description**
- Build our own custom linux image.
- This will be a huge effort, as we need to decide between using Yocto or Buildroot, as well as discover how ST provides their layers and recipes.
- Digikey playlist: [Intro to Embedded Linux](https://www.digikey.com/en/maker/projects/intro-to-embedded-linux-part-1-buildroot/a73a56de62444610a2187cd9e681c3f2)
- Covers both Yocto and Buildroot.
- Happens to use the same dev board.
- Using Qt5 should be fine for our first attempt. We may consider integrating Qt6 later.

w/ Yocto:
- Wiki: [OpenEmbedded](https://wiki.st.com/stm32mpu/wiki/OpenEmbedded)

w/ Buildroot:
- Blog: [Updated buildroot support for stm31MP1 platforms](https://bootlin.com/blog/updated-buildroot-support-for-stm32mp1-platforms/)

**Definition of Done**
- Documentation
- A functionally running board with our own linux image

Start with the linked Intro to Embedded Linux playlist, then compare the OpenEmbedded/Yocto STM32MPU guidance with the Buildroot STM32MP1 support article. Decide which approach fits the board and Qt5 plan; done means documenting the choice and producing a functionally running board with the project’s own Linux image.

Written by the indexing model from the issue text.