Revert "feat: generate addons readme in pre-commit"

This reverts commit a1551e5.

Rational: The call of oca-gen-addon-readme will generate conflicts in the readme.rst file when 2 PRs modify the same module.
See OCA#190 (comment)

src/.pre-commit-config.yaml.jinja

@@ -114,13 +114,6 @@ repos:
       - id: oca-update-pre-commit-excluded-addons
       - id: oca-fix-manifest-website
         args: ["{{ repo_website }}"]
-      - id: oca-gen-addon-readme
-        args:
-          - --addons-dir=.
-          - --branch={{ "%.01f" | format(odoo_version) }}
-          - --org-name={{ org_slug }}
-          - --repo-name={{ repo_slug }}
-          - --if-source-changed
       {%- if use_pyproject_toml and generate_requirements_txt %}
       - id: oca-gen-external-dependencies
       {%- endif %}