Add stack (Jitsu, ClickHouse, Cube) introduction to product analytics docs
The following discussion from !104391 (merged) should be addressed:
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@jiaan started a discussion: (+1 comment) thought (if-minor): This is minor and could be a follow-up since we're in alpha, but here we're listing the required stack details without any context on what the stack exactly is or why we need this. WDYT about adding a short section to describe the stack with external links to the software's website / documentation. This is something we currently do for features that interact with 3rd parties, for example https://docs.gitlab.com/charts/advanced/external-object-storage/#google-cloud-cdn.
/cc @lciutacu as the Technical Writing expert incase you have any opinions on this.