docs: update stacks.js pages

[janniks]

• updates to Stacks.js pages
• adds code tabs, will add more of these (e.g. npm VS yarn; stacks.js VS connect)
• removes legacy pages

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Name	Status	Preview	Comments	Updated (UTC)
hiro-systems-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 26, 2024 1:34pm

[ryanwaits]

Reference:

[janniks]

Ah, thx. Updated the rule to only target the tabs (header), what I had intended ^^