README.md: Properly display examples.

Resize examples.

Polish repository.

Update dependencies.

Fix Project.toml project name.

Adjust .gitignore to new file locations.

Fill in usage.ipynb.

Widen accepted input arrays; adjust default parameters.

Remove Images.jl dependency.

Fix type.

Fix main.jl.

Add `generate` method that handles input arrays instead of filenames.

Rename from wavefuntioncollapse to WaveFunctionCollapse.

Fix .gitignore.

Delete old notebook files.