👌 Template: Consistently use docs:serve

The MyST and MkDocs Hatch scripts for serving the documentation locally were different,
to match the corresponding commands of the tools:

* MyST: `hatch run docs:start` ~ `myst start`
* MkDocs: `hatch run docs:serve` ~ `mkdocs serve`

However, it's probably better to be uniform in our hatch script names, to avoid mixing
them up when working across packages which use both documentation tools. We pick
`serve` here, since that's what we are doing.

Author: mbercx

template/pyproject.toml.jinja

@@ -30,7 +30,7 @@ dependencies = [
   "mystmd"
 ]
 scripts.build = "cd docs && myst build"
-scripts.start = "cd docs && myst start"
+scripts.serve = "cd docs && myst start"
 {%- endif -%}
 
 {%- if docs == 'mkdocs' -%}