Fixed telemetry link, moved darkmode button, added Tangel specific address conversion (tg..) altered styling of nav, separated address page into generals and tutorials, fixed trailing slash issue for SEO, added new gadget page with youtube embeds

[thomivy]

Summary of changes

• Fixed telemetry link,
• moved darkmode button,
• added Tangle specific address conversion (tg..)
• altered styling of nav,
• separated address page into generals and tutorials,
• fixed trailing slash issue for SEO,
• added new gadget page with youtube embeds

One CI issue is the same Bad Gateway error on the Dapp:

* [502] [https://app.tangle.tools/claim](https://app.tangle.tools/claim) | Failed: Network error: Bad Gateway

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Code Checklist

• [x] I have tested that prove my changes are working as intended
• [x] I have added necessary documentation (if appropriate)

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