docs: reframe pitch as workload-agnostic and document workflow activation

[arnaudlh]

Summary

Documentation audit fixes — reframe the project pitch as workload-agnostic (any Azure workload), document the .exampleyml → .yml activation convention, fix install snippets, remove stale workflow references, and add two new end-to-end deployment examples.

Changes

Pitch (workload-agnostic)

• README.md, plugin.json, website/docs/intro.md, website/docs/vision.md — removed enumerations of workload types from lead sentences and "Built for" bullets
• plugin.json keywords: dropped infrastructure/iac, added workloads/copilot-agents
• Workload types now appear only in concrete examples

Workflow activation

• Added :::info[Activation required] callouts to the workflows overview and each *.exampleyml page explaining the rename step performed by /git-ape-onboarding
• Explicit callout in website/docs/getting-started/onboarding.md

Install snippet consistency

• Corrected copilot plugin install form across intro.md and personas/for-engineers.mdx to use git-ape@git-ape and added copilot plugin li

Stale references removed

• Dropped git-ape-drift.yml and git-ape-ttl-reaper.yml from the WORKFLOWS array in .github/workflows/git-ape-verify.exampleyml
• Removed stale @azure-iac-generator row from use-cases/import-existing-infra.md

Examples

• Added Example 3 (AI knowledge-base: Function App + Azure OpenAI + AI Search) and Example 4 (streaming data platform: Event Hubs + Stream Analytics + ADLS Gen2) to use-cases/deploy-anything.md

Generator

• scripts/generate-docs.js: moved azure-rest-api-reference to Pre-Deploy phase; emits activation callout for .exampleyml pages
• Auto-generated 7 new workflow pages now reflecting all CI workflows under .github/workflows/

Validation

• node scripts/validate-structure.js → PASSED
• npm run build (Docusaurus) → SUCCESS
• actionlint -config-file .github/actionlint.yaml → clean
• Generator output: 8 agents, 13 skills, 13 workflows