chore(model gallery): add sd-1.5-ggml and sd-3.5-medium-ggml

[mudler]

Description

This PR adds stablediffusion 1.5 and 3.5 with the ggml backend into the gallery

Notes for Reviewers

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[github-actions]

yamllint Failed

Show Output

::group::gallery/index.yaml
::error file=gallery/index.yaml,line=11095,col=5::11095:5 [indentation] wrong indentation: expected 6 but found 4
::error file=gallery/index.yaml,line=11118,col=5::11118:5 [indentation] wrong indentation: expected 6 but found 4
::endgroup::

Workflow: Yamllint GitHub Actions, Action: __karancode_yamllint-github-action, Lint: gallery