chore: remove dependabot cfg files (#58)

This pull request removes configuration files related to automated
dependency updates and semantic PR title linting. These changes disable
automated workflows for managing dependencies and enforcing semantic PR
titles in the repository.

Workflow and automation removal:

* Deleted `.github/dependabot.yml`, which disables automated dependency
update management for GitHub Actions, npm, and Cargo packages.
* Deleted `.github/workflows/semantic-pr-lint.yml`, which disables the
workflow that enforced semantic PR titles on pull requests.

Author: gvieira18