Sixteen slides built around the live demo: two orientation diagrams (site
shape with environments/zones/satellite, and the pull-based GitOps repo
topology), a condensed module anatomy anchored on the real podman.json from
Community/src/larsrossen/containers/podman, the three demo beats (test
environment, module add, prove it), and the identity hand-out.
Mermaid subgraph titles collide with the node row under flowchart TB, so both
diagrams use LR; _class directives repeat 'invert' because a local _class
replaces the deck-level one rather than adding to it.
Adds a second Marp source root. Decks under slides/ build to an output path
mirroring their repo path, so slides/TAPPaaS/HOW-TO/NewModule/index.md is
served at slides.makerfloss.eu/TAPPaaS/HOW-TO/NewModule/. Decks in
docs/presentations/ keep their flat URLs.
The deck itself is a frame: structure and headings from the real
src/apps/00-Template anatomy, content still to be written. Unfinished spots
are written as inline `TODO: ...` and rendered in red so a half-finished
deck cannot be presented by accident.
Also fixes the Docker fallback, which could not write to a mktemp directory
on macOS (not shared with Docker Desktop) and must not be passed --user.
