docs,internal,etc: update LXD docs URLs

[elijahgreenstein]

Description

LXD docs are now at https://canonical.com/lxd/docs/.

Docs

Procedure:

• I have checked and added or updated relevant documentation.
• I have checked and added or updated relevant release notes.
• I have included the technical author in the review.

[dmitry-lyfar]

@elijahgreenstein thanks for the update, please note that it breaks 3 unit tests with error messages that give the link to the LXD docs.

[Copilot]

Pull request overview

Updates hard-coded links to LXD documentation across Workshop’s Go code and Sphinx/Markdown documentation to reflect Canonical’s new LXD docs location (https://canonical.com/lxd/docs/).

Changes:

• Replaced legacy documentation.ubuntu.com/lxd/... URLs with canonical.com/lxd/docs/... in user-facing docs and internal comments.
• Updated shared documentation link definitions (Sphinx rst_epilog and style guides) to point at the new LXD docs base.
• Refreshed various tutorial/reference pointers to keep external links consistent.

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
internal/workshop/lxd/firewall.go	Updates firewall troubleshooting doc link to the new LXD docs host.
internal/interfaces/lxd_device/spec.go	Updates proxy-device documentation reference URL.
docs/tutorial/part-4-craft-sdks.rst	Updates tutorial links to LXD REST API and installation/daemon docs.
docs/tutorial/part-1-get-started.rst	Updates onboarding tutorial links to LXD REST API and installation/daemon docs.
docs/security.md	Updates LXD and projects documentation links in security overview.
docs/reference/workshops.rst	Updates storage-pools documentation link.
docs/index.rst	Updates home-page related links list for LXD.
docs/how-to/fix-workshops/fix-installation.rst	Updates troubleshooting-guide link.
docs/doc-style-guide.md	Updates example/reference LXD link used in documentation guidance.
docs/contributing/maintenance.rst	Updates LXD link used in maintenance/build instructions.
docs/conf.py	Updates Sphinx rst_epilog link targets for LXC/LXD.
cmd/workshop/exec.go	Updates inline comment URL describing lxc exec behavior.
.github/skills/documentation-style/references/doc-style-guide.md	Mirrors doc style guide link updates in the skill reference copy.

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