[docs] Add gtm

[p-malecki]

Description

Adds GTM integration.

[Copilot]

Pull request overview

Adds Google Tag Manager (GTM) support to the docs-gesture-handler Docusaurus site so it can load the GTM container during site rendering/build.

Changes:

• Add @docusaurus/plugin-google-tag-manager dependency to the docs package.
• Register the GTM plugin in docusaurus.config.js with a specific containerId.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
packages/docs-gesture-handler/package.json	Adds the Docusaurus GTM plugin dependency.
packages/docs-gesture-handler/docusaurus.config.js	Enables/configures the GTM plugin with a container ID.

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[Copilot]

GTM is enabled unconditionally, so local docusaurus start and any non-prod builds will also load the GTM container and potentially send real analytics traffic. Consider only enabling this plugin when NODE_ENV === 'production' (similar to other conditional plugins here) and/or gating it behind an env var so forks/preview deployments don’t report to the production container.

[Copilot]

With this GTM plugin added, the site will also still load the existing googleAnalytics UA tracking configured in the classic preset earlier in this file. Having both GA (UA-*) and GTM enabled can cause duplicate pageview tracking / conflicting analytics. If GTM is intended to replace GA, remove/disable the googleAnalytics block (or gate one of the integrations) so only one runs in production.

[j-piasecki]

LGTM, if the things copilot pointed out aren't a problem then we can go ahead and merge it.