Use description in README and update example description

This makes the example repo more readable on PyPI
Also fix test that updates example to use answers from example-answers.yml

Author: coretl

example-answers.yml

@@ -1,7 +1,7 @@
 author_email: [email protected]
 author_name: Tom Cobb
 component_owner: group:default/sscc
-description: An expanded python-copier-template with all the options
+description: An expanded https://github.com/DiamondLightSource/python-copier-template to illustrate how it looks with all the options enabled.
 distribution_name: dls-python-copier-template-example
 docker: true
 docs_type: sphinx

template/README.md.jinja

@@ -5,6 +5,8 @@
 
 # {{ package_name }}
 
+{{description}}
+
 This is where you should write a short paragraph that describes what your module does,
 how it does it, and why people should use it.
 

tests/test_example.py

@@ -81,12 +81,9 @@ def test_example_repo_updates(tmp_path: Path):
     run("git config user.email '[email protected]'")
     run("git config user.name 'Your Name'")
     run("git commit -am 'Update src'")
-    run("copier update --trust --vcs-ref=HEAD -A")
+    run(f"copier update --trust --vcs-ref=HEAD --data-file {TOP}/example-answers.yml")
     output = run(
         "diff -ur --exclude=.git --ignore-matching-lines='_commit: '"
         f" {generated_path} {example_path}"
     )
     assert not output, output
-
-
-# TODO: check that copier update python-copier-template-example matches generated