Update the CONTRIBUTING file

Create sections in the documentation

docs/developer_documentation/workflows/changelog.md

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+# Changelog fragments
+
+```{include} ../../../CONTRIBUTING.md
+:start-after: "## Changelog fragments"
+:end-before: "## Make a release"
+```

docs/developer_documentation/workflows/git.md

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+# Git workflow
+
+```{include} ../../../CONTRIBUTING.md
+:start-after: "## Git workflow"
+:end-before: "## Changelog fragments"
+```

docs/developer_documentation/workflows/index.md

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+# Development workflows
+
+Funkwhale follows workflows for each area of development and release management. You can find a breakdown of these in this section.
+
+```{toctree}
+---
+caption: Workflows
+maxdepth: 1
+---
+
+git
+changelog
+release
+
+```

docs/developer_documentation/workflows/release.md

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+# Make a release
+
+```{include} ../../../CONTRIBUTING.md
+:start-after: "## Make a release"
+```