diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 000000000..6ff874cbe
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,18 @@
+.docker export-ignore
+.github export-ignore
+assets export-ignore
+tests export-ignore
+.codecov.yml export-ignore
+.editorconfig export-ignore
+.eslintrc.js export-ignore
+.gitattributes export-ignore
+.gitignore export-ignore
+php-cs-fixer.dist.php export-ignore
+babel.config.js export-ignore
+package.json export-ignore
+php-cs-fixer.sh export-ignore
+phpstan.neon export-ignore
+phpstan.sh export-ignore
+phpunit.xml.dist export-ignore
+webpack.config.js export-ignore
+yarn.lock export-ignore
\ No newline at end of file
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index f84164698..22e4aa646 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -1,15 +1,16 @@
 # Contributing
 
-Kimai is an open source project, contributions made by the community are welcome. 
+Kimai is an open source project, contributions made by the community are welcome.
+But we can only accept contributions with a signed CLA (Contributor License Agreement) to prevent issues in the future (you will see a link when opening a PR).
+
 Send your ideas, code reviews, pull requests and feature requests to help to improve this project.
 
 ## Pull request rules
 
+- Make your changes in a new git branch, based on the latest code in `main`
 - Apply our code-style by running `composer codestyle-fix`
 - Run the static code analysis with `composer phpstan`
-- Verify everything still works with `composer tests-unit` and `composer tests-integration`
+- Verify everything still works with `composer tests-unit` 
 - Add tests for your changes
-- When sending in a PR, you must accept that your contributions/code will be published under MIT license (see the [LICENSE](LICENSE) file as well), otherwise your PR will be closed
-- If one of the PR checks/builds fails, fix it before asking for a review
 
 Further documentation can be found in the [developer documentation](https://www.kimai.org/documentation/developers.html).
diff --git a/SECURITY.md b/SECURITY.md
index 380772c60..dffe63c62 100644
--- a/SECURITY.md
+++ b/SECURITY.md
@@ -7,5 +7,4 @@ As announced in the [README](README.md) security fixes will only be added to the
 | main branch          | :white_check_mark: |
 | older releases       | :x:                |
 
-
 You find all information in our [Bughunter documentation](https://www.kimai.org/documentation/bughunter.html).   
diff --git a/assets/.gitignore b/assets/.gitignore
deleted file mode 100644
index e69de29bb..000000000
diff --git a/config/packages/twig.yaml b/config/packages/twig.yaml
index 410a41af1..90a442037 100644
--- a/config/packages/twig.yaml
+++ b/config/packages/twig.yaml
@@ -5,7 +5,5 @@ twig:
         - 'form/vertical.html.twig'
     exception_controller: null
     paths:
-        # used in templates/emails/layout.html.twig
-        '%kernel.project_dir%/assets/css': css
         '%kernel.project_dir%/templates/bundles/TablerBundle': theme
         '%kernel.project_dir%/vendor/kevinpapst/tabler-bundle/templates': theme
diff --git a/assets/css/emails.css b/templates/emails/css/emails.css
similarity index 100%
rename from assets/css/emails.css
rename to templates/emails/css/emails.css
diff --git a/templates/emails/layout.html.twig b/templates/emails/layout.html.twig
index 547cc2f7a..32171f464 100644
--- a/templates/emails/layout.html.twig
+++ b/templates/emails/layout.html.twig
@@ -1,4 +1,4 @@
-{% apply inky_to_html|inline_css(source('@css/emails.css')) %}
+{% apply inky_to_html|inline_css(source('emails/css/emails.css')) %}
 
     <spacer size="32"></spacer>