rpbourret

Add a CSS codelab

1

## The basics - [x] I [validated my changes](https://developers.google.com/blockly/guides/contribute/samples#making_and_verifying_a_change) ## The details ### Resolves Adds a CSS codelab. ### Proposed Changes Adds a CSS codelab in the form of a...

### Check for duplicates - [x] I have searched for similar issues before opening a new one. ### Component _No response_ ### Description [Commit c524d26](https://github.com/RaspberryPiFoundation/blockly-samples/commit/c524d2659977b7581db506be62b156eb6e5600c3) converted [toolboxCategories.js](https://github.com/RaspberryPiFoundation/blockly-samples/blob/master/plugins/dev-tools/src/toolboxCategories.js) from XML to...

Replace calls to `Workspace.variableMethod` with calls to `Workspace.getVariableMap().variableMethod`

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### Check for duplicates - [x] I have searched for similar issues before opening a new one. ### Component The following plugins: * Shareable procedure blocks * Plus-minus mutator blocks...

### Check for duplicates - [x] I have searched for similar issues before opening a new one. ### Component Plus-minus mutator block plugin ### Description [PR 8369](https://github.com/google/blockly/pull/8369) added the `IVariableModel`...