kci-gitlab: docs: Add images

Add images to kci-gitlab documentation.

Signed-off-by: Vignesh Raman <vignesh.raman@collabora.com>
Signed-off-by: Helen Koike <helen.koike@collabora.com>

---
KCI_PATCH_SERIES_SIZE=3
KCI_CHECKPATCH_OPTIONS="--ignore FILE_PATH_CHANGES"