* Configures automated spell checking with codespell
Adds GitHub workflows and configuration files for automated spell checking using `codespell`.
This includes:
- A workflow for checking pull requests and preventing new typos
- A workflow for automatically fixing typos in the main codebase
- Configuration files for `codespell` to ignore specific terms and file types
- Documentation on how to use and configure the spell checking workflows.
* Corrects minor spelling and grammar errors.
Magne Sjaastad
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