Remove the old CONTRIBUTING section

Now the contributing guide is one document in the new community section.

Signed-off-by: Leandro Lucarella <[email protected]>

Author: llucax

cookiecutter/{{cookiecutter.github_repo_name}}/docs/CONTRIBUTING.md

@@ -5,5 +5,4 @@
 {%- else %}
 * [API Reference](reference/)
 {%- endif %}
-* [Contributing](CONTRIBUTING.md)
 * [Community](community/)

cookiecutter/{{cookiecutter.github_repo_name}}/docs/SUMMARY.md

@@ -1,4 +1,3 @@
 * [Home](index.md)
 * [API Reference](reference/)
-* [Contributing](CONTRIBUTING.md)
 * [Community](community/)

tests_golden/integration/test_cookiecutter_generation/actor/frequenz-actor-test/docs/CONTRIBUTING.md

@@ -1,5 +1,4 @@
 * [Home](index.md)
 * [Protobuf API Reference](protobuf-reference/)
 * [Python API Reference](python-reference/)
-* [Contributing](CONTRIBUTING.md)
 * [Community](community/)

tests_golden/integration/test_cookiecutter_generation/actor/frequenz-actor-test/docs/SUMMARY.md

@@ -1,4 +1,3 @@
 * [Home](index.md)
 * [API Reference](reference/)
-* [Contributing](CONTRIBUTING.md)
 * [Community](community/)

tests_golden/integration/test_cookiecutter_generation/api/frequenz-api-test/docs/CONTRIBUTING.md

@@ -1,4 +1,3 @@
 * [Home](index.md)
 * [API Reference](reference/)
-* [Contributing](CONTRIBUTING.md)
 * [Community](community/)