Fix playground deploy: use relative path for bundle.js

[Copilot]

The deployed playground page fails to load with "expr-eval library not loaded" because the HTML references /dist/bundle.js using an absolute path. GitHub Pages serves from /expr-eval/ subdirectory, causing the absolute path to resolve incorrectly.

Changes

• Changed script src from /dist/bundle.js to ./dist/bundle.js in samples/language-service-sample/index.html

<!-- Before: resolves to https://pro-fa.github.io/dist/bundle.js (404) -->
<script src="/dist/bundle.js"></script>

<!-- After: resolves to https://pro-fa.github.io/expr-eval/dist/bundle.js -->
<script src="./dist/bundle.js"></script>

Original prompt

The "deploy playground" action does deploy the html but when loading the page it fails with this message: "expr-eval library not loaded. Please run: npm run build"

Fix the pipieline to ensure that it can find the library. (The expr-eval library is the library that this repository provides)

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