chore(backend gallery): add description for remaining backends

[mudler]

Description

This PR adds metadata and description for the remaining backends in the backend gallery

Notes for Reviewers

Signed commits

• Yes, I signed my commits.

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[github-actions]

yamllint Failed

Show Output

::group::backend/index.yaml
::warning file=backend/index.yaml,line=2,col=1::2:1 [document-start] missing document start "---"
::error file=backend/index.yaml,line=9,col=5::9:5 [indentation] wrong indentation: expected 3 but found 4
::error file=backend/index.yaml,line=103,col=5::103:5 [indentation] wrong indentation: expected 3 but found 4
::error file=backend/index.yaml,line=105,col=5::105:5 [indentation] wrong indentation: expected 3 but found 4
::error file=backend/index.yaml,line=140,col=5::140:5 [indentation] wrong indentation: expected 3 but found 4
::error file=backend/index.yaml,line=142,col=5::142:5 [indentation] wrong indentation: expected 3 but found 4
::error file=backend/index.yaml,line=173,col=5::173:5 [indentation] wrong indentation: expected 3 but found 4
::error file=backend/index.yaml,line=175,col=5::175:5 [indentation] wrong indentation: expected 3 but found 4
::error file=backend/index.yaml,line=199,col=5::199:5 [indentation] wrong indentation: expected 3 but found 4
::error file=backend/index.yaml,line=202,col=5::202:5 [indentation] wrong indentation: expected 3 but found 4
::error file=backend/index.yaml,line=234,col=5::234:5 [indentation] wrong indentation: expected 3 but found 4
::error file=backend/index.yaml,line=236,col=5::236:5 [indentation] wrong indentation: expected 3 but found 4
::error file=backend/index.yaml,line=241,col=26::241:26 [trailing-spaces] trailing spaces
::error file=backend/index.yaml,line=263,col=5::263:5 [indentation] wrong indentation: expected 3 but found 4
::error file=backend/index.yaml,line=273,col=5::273:5 [indentation] wrong indentation: expected 3 but found 4
::error file=backend/index.yaml,line=301,col=5::301:5 [indentation] wrong indentation: expected 3 but found 4
::error file=backend/index.yaml,line=305,col=5::305:5 [indentation] wrong indentation: expected 3 but found 4
::error file=backend/index.yaml,line=333,col=5::333:5 [indentation] wrong indentation: expected 3 but found 4
::error file=backend/index.yaml,line=338,col=5::338:5 [indentation] wrong indentation: expected 3 but found 4
::endgroup::

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