web-e-stepper: a README

[martin-henz]

The web plugin of the e-stepper was the only one of the three e-stepper packages without a README (part of source-academy/py-slang#510). It says what the package is and how it relates to common-e-stepper and runner-e-stepper; what it does (the channel, the replay request, the E-Stepper tab); what the tab shows (explanation, program with EnvBlock brackets and Ref badges, environments drawn with the host's CSE machine diagram or with the plugin's own, controls, keyboard); how the bundle is loaded and built; and where things are in the source. It links to the guide for students and to the design note.

No code change, so no changeset. Checked against EStepperHostPlugin.tsx and EStepperView.tsx.

🤖 Generated with Claude Code

[changeset-bot]

⚠️ No Changeset found

Latest commit: 2af56b0

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR