Add changelog to the docs

[ElBe-Plaq]

Description

Added CHANGELOG.md to the docs by cloning it and adding it in mkdocs.yml.

Closes #14.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• Something else

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new errors or linter warnings
• My changes generate no problems with other code
• I have added tests that prove my fix is effective or that my feature works
• New and existing tests passed locally with my changes

[mergify]

Merging pull request

Successful checks:

• MegaLinter

• label

• Summary

• pre-commit.ci - pr

• docs/readthedocs.org:i-language-rust

• CommitCheck