chore: Remove unused packages

[felixpalmer]

A small change, but a few less dependencies for dependabot to pull in, e.g. #257

[gemini-code-assist]

Summary of Changes

Hello @felixpalmer, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on optimizing the project's dependency tree by identifying and removing packages that are no longer in use. The primary goal is to reduce the overall project footprint and enhance maintainability by lessening the burden of dependency management and security monitoring. This cleanup ensures that the project only includes necessary components, contributing to a more efficient and robust development environment.

Highlights

• Dependency Reduction: Removed @webcomponents/webcomponentsjs and lit-analyzer from the project's devDependencies.
• Yarn Lock Cleanup: Significantly reduced the size and complexity of yarn.lock by removing numerous transitive dependencies associated with the uninstalled packages.
• Improved Maintainability: Decreased the number of packages for dependabot to monitor, leading to fewer potential alerts and a more streamlined dependency management process.

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[gemini-code-assist]

Code Review

This pull request removes two unused development dependencies, @webcomponents/webcomponentsjs and lit-analyzer. This is a good housekeeping change that reduces the overall dependency footprint of the project. The removal of lit-analyzer is appropriate as it is deprecated, and its functionality is covered by other tools in the project like ts-lit-plugin. The @webcomponents/webcomponentsjs polyfill is also correctly identified as unnecessary given the project's browser support targets. The changes look good and are approved.