Update development environment

[joelvaneenwyk]

This pull request includes various changes across multiple files to improve the configuration, documentation, and dependencies of the project. The most important changes include the addition of a new dev container configuration, updates to the .editorconfig and .github configurations, and enhancements to the documentation.

Configuration Updates:

• Added a new dev container configuration for Rust development in .devcontainer/devcontainer.json. This includes setting up the Rust image, adding features, and customizing VSCode extensions.
• Updated .editorconfig to set the indent_size to 2 for YAML files.
• Added a new dictionary file .github/config/eww.dict to include custom words for spell checking.
• Updated .github/dependabot.yml to include a weekly update schedule for devcontainers.
• Added a new .prototools file to specify versions for Deno, npm, and task, along with a plugin configuration.

Documentation Enhancements:

• Added a VSCode extensions recommendation file .vscode/extensions.json to suggest the eww-yuck.yuck extension.
• Updated CHANGELOG.md with new sections and formatting for better readability and structure. [1] [2] [3] [4] [5]
• Added a markdown linting configuration to README.md to disable specific markdown linting rules.
• Improved the structure and readability of various documentation files, including YUCK_MIGRATION.md, docs/src/configuration.md, docs/src/eww.md, docs/src/examples.md, docs/src/expression_language.md, docs/src/magic-vars.md, docs/src/troubleshooting.md, and docs/src/widgets.md. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15]

Dependency Updates:

• Updated Cargo.toml to use a Git repository for the simple-signal dependency instead of a version number.
• Added a new package.json file to define the project's metadata, scripts, and dependencies for building with task.