Add CDN installation to JS docs

[hannahblair]

Description

Please include a concise summary, in clear English, of the changes in this pull request. If it closes an issue, please mention it here.

Closes: #8391

🎯 PRs Should Target Issues

Before your create a PR, please check to see if there is an existing issue for this change. If not, please create an issue before you create this PR, unless the fix is very small.

Not adhering to this guideline will result in the PR being closed.

Tests

1. PRs will only be merged if tests pass on CI. To run the tests locally, please set up your Gradio environment locally and run the tests: bash scripts/run_all_tests.sh

2. You may need to run the linters: bash scripts/format_backend.sh and bash scripts/format_frontend.sh

[gradio-pr-bot]

🪼 branch checks and previews

•	Name	Status	URL
	Spaces	ready!	Spaces preview
	Website	ready!	Website preview
:unicorn:	Changes	detected!	Details

---

Install Gradio from this PR

pip install https://gradio-builds.s3.amazonaws.com/808eb1a188ce15735700f6e74f2bf26fa991a3fb/gradio-4.31.5-py3-none-any.whl

Install Gradio Python Client from this PR

pip install "gradio-client @ git+https://github.com/gradio-app/gradio@808eb1a188ce15735700f6e74f2bf26fa991a3fb#subdirectory=client/python"

Install Gradio JS Client from this PR

npm install https://gradio-builds.s3.amazonaws.com/808eb1a188ce15735700f6e74f2bf26fa991a3fb/gradio-client-0.19.4.tgz

[gradio-pr-bot]

🦄 change detected

This Pull Request includes changes to the following packages.

Package	Version
@gradio/client	patch
gradio	patch

• [ ] Maintainers can select this checkbox to manually select packages to update.

With the following changelog entry.

Add CDN installation to JS docs

Maintainers or the PR author can modify the PR title to modify this entry.

#### Something isn't right?

- Maintainers can change the version label to modify the version bump. - If the bot has failed to detect any changes, or if this pull request needs to update multiple packages to different versions or requires a more comprehensive changelog entry, maintainers can [update the changelog file directly](https://github.com/gradio-app/gradio/edit/js-client-cdn/.changeset/better-dingos-bet.md).

[abidlabs]

Super helpful @hannahblair thanks! Just a suggestion that we provide a link to the latest version of the gradio and recommend users to hardcode when putting in production

[hannahblair]

thanks @abidlabs!