Add a prominent danger admonition ('One name everywhere — repo = container =
volumes') right under the intro: the repo name is the name; the compose
service key, container_name, and every named volume must all use it. Spell
out the consequence — mismatched names break deploy, monitoring, and log
scraping, which key off the repo name.
Make the compose example teach it: rename yourapp -> myrepo throughout
(service key, container_name: myrepo, myrepo-data volume) with annotations
calling out each spot where the repo name must appear.
Verified in-browser; mkdocs build --strict clean.
Signed-off-by: disqualifier <dev@disqualifier.me>