docs: cross-link the technical manual

[JarbasAl]

Summary

• docs/index.md, ovos-skill.md, decorators.md, skill-classes.md: shrink duplicated content and link to the corresponding OVOS Technical Manual pages instead of restating them.
• Fix stale entry-point group name opm.skills -> opm.skill in README.md and docs/index.md.
• Fix docs/skill-classes.md and docs/index.md: remove the nonexistent CommonQuerySkill base class, document @common_query() on a plain OVOSSkill instead, and add the missing IdleDisplaySkill to the hierarchy.
• Fix docs/skill-interaction.md: the documented default ask_yesno plugin name (ovos-solver-yes-no-plugin) does not match any registered opm.agents.yesno entry point; the shipped plugin is ovos-yes-no-plugin, and the lookup always falls back to HeuristicYesNoEngine.

The OVOS Technical Manual (https://tigregotico.github.io/ovos-technical-manual/) is the canonical, actively maintained doc set for skill authoring; these repo docs now point into it instead of drifting independently.

Test plan

• Docs-only change, no code affected.
• Spot-check rendered links resolve on the manual site.

🤖 Generated with Claude Code

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Latest Version: 9.3.2a2

✅ ovos_workshop/version.py — Version file
✅ README.md — README
✅ LICENSE — License file
✅ pyproject.toml — pyproject.toml
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