feat: remove stablediffusion-ggml from main binary

[mudler]

Description

This PR removes stablediffusion-ggml from the main binary and builds a separate backend image (as with the others)

Notes for Reviewers

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[github-actions]

yamllint Failed

Show Output

::group::backend/index.yaml
::error file=backend/index.yaml,line=35,col=45::35:45 [trailing-spaces] trailing spaces
::warning file=backend/index.yaml,line=49,col=6::49:6 [comments] missing starting space in comment
::endgroup::

Workflow: Yamllint GitHub Actions, Action: __karancode_yamllint-github-action_2, Lint: backend