Updated initial batch of links for review

[Namrathabp]

For canonical/open-documentation-academy#303.

I have started updating the old snapcraft.io/docs links to the new documentation.ubuntu.com structure.
I need a quick confirmation on my approach: Many specific interface pages (e.g., desktop-interface) do not have a direct equivalent on the new site yet also previously it was common for all files. But in new site, the structure is different. Also, I observed that for few inks, direct interface is not available.

Is this the correct fallback? Once confirmed, I will proceed with updating the remaining files.

---

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• I've signed the CLA.
• I've successfully run make lint && make test.
• I've added or updated any relevant documentation.
• I've updated the relevant release notes.

[medubelko]

@Namrathabp Thank you so much for putting this together!

The scope for the PR was originally for CLI commands, so I've left some suggestions clarifying which links shouldn't be changed.

Also, any of the links to dashboard.snapcraft.io and api.snapcraft.io should be left as-is, as a new site for the SnapD site is coming in the new year.

Any of the interface pages on snapcraft.io should remain the same, because SnapD is responsible for them, not Snapcraft.

[Namrathabp]

Hi @medubelko, thanks for the guidance!

I have reverted the changes to the interface pages and dashboard links as requested.

I've also resolved the conversation threads above. The PR is now ready for a re-review when you have a moment!