manual: document working on docs

Dependencies

• [2] LYO7KK3J Address PR comments:
• [3] DWMH6NFB docs: mention foreman under hacking
• [*] KPWMZFHZ Add runHydra shell
• [*] 3JXCTKEC Add markdown files for documentation
• [*] BZQQZDPL doc: document how to run tests

Change contents

• edit in Procfile at line 6
  [2.175]
  + manual: ./foreman/start-manual.sh
• edit in doc/manual/src/hacking.md at line 46
  [7.688]

  [3.306]
  +

  + ## Working on the Manual

  +

  + By default, `foreman start` runs mdbook in "watch" mode. mdbook listens

  + at [http://localhost:63332/](http://localhost:63332/) by default, and

  + will reload the page every time you save.
• file addition: start-manual.sh (---r------)
  [2.425]
  + #!/bin/sh

  +

  + mdbook serve \

  + --port 63332 \

  + --dest-dir $(pwd)/.hydra-data/manual \

  + $(pwd)/doc/manual/