move BC policy into documentation

SECURITY.md

@@ -1,16 +1,5 @@
 # Security Policy
 
-## Supported Versions
-
-We support only the latest version of Ragna, and we use [SemVer](https://semver.org/)
-for versioning. As an early-stage project, we do not guarantee backwards compatibility
-for minor versions until the 1.0 release.
-
-You should feel comfortable upgrading if you're using our documented public APIs and pay
-attention to `DeprecationWarning`s. Whenever there is a need to break compatibility, it
-is announced in the [Changelog](docs/references/changelog.md) and will raise a
-`DeprecationWarning` before it's finally really broken.
-
 ## Reporting a Vulnerability
 
 If you think you found a vulnerability, please report it at

docs/install.md

@@ -35,3 +35,14 @@ pip install --upgrade ragna
 ```
 ragna --version
 ```
+
+## Backwards compatibility
+
+As an early-stage project and as long as we are on a `0.` version, we allow ourselves
+the **option to break backwards compatibility**. This is done to accommodate feature
+requests that require large refactorings, which inadvertently happen in the beginning.
+The amount and severity of the breaking changes should diminish as the project matures.
+All such changes will be announced in the [release notes](references/release-notes.md).
+At some point, we'll release a `1.0.0` version and switch to
+[SemVer](https://semver.org/), imposing strict backwards compatibility rules onto
+ourselves.

docs/references/changelog.md → docs/references/release-notes.md

 # Release notes 
 # Release notes 

mkdocs.yml

@@ -89,4 +89,4 @@ nav:
       - "references/rest-api.md"
       - "references/cli.md"
       - "references/faq.md"
-      - "references/changelog.md"
+      - "references/release-notes.md"