Update add-on to app terminology per hacs/addons#37

[Copilot]

Reflects terminology change from hacs/addons#37 per HA architecture discussion #1287: user-facing "Add-on" → "App" for the Get HACS tool.

Changes

• faq/addons.md: Updated title, description, and content to use "app" terminology throughout, with updated glossary links to #app
• download/prerequisites.md: "add-on to download HACS" → "app to download HACS", "HACS is not an add-on" → "HACS is not an app" with updated glossary link
• download/download.md: Updated installation instructions to reference "app" for the Get HACS tool

Preserved (intentionally)

• "add-on repository" references — the repository is still technically an add-on repository
• HA UI references like "Missing add-on repository" dialog

Original prompt

Make sure the documentation reflects the changes in hacs/addons#37

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[ludeeus]

@copilot hacs/default#37 has now been merged, re-check it and adjust.

[Copilot]

@copilot hacs/default#37 has now been merged, re-check it and adjust.

Reviewed the merged PR. The documentation changes in fb864fc are aligned:

• "Get HACS add-on" → "Get HACS app"
• "add-on for downloading HACS" → "app for downloading HACS"
• Preserved "add-on repository" terminology (matches HA UI dialogs and technical identifiers that weren't changed in the PR)

[Copilot]

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