fix(docs): set explicit download filename on catalogue index buttons

[FullGas1]

Closes #11

Summary

• CI copies .lua files to docs/downloads/ for same-origin download
• Download buttons use download="plugin-name.lua" for correct filename
• MkDocs hook (hooks.py) adds target="ext-{id}" rel="noopener" to all external links
• CONTEXT.md and ADRs 0001-0003 migrated to English

Test plan

• Verified on dev site: .lua download triggers file save with correct filename
• Verified on dev site: mod button opens in new tab, reused on repeated clicks

Summary by Sourcery

Documentation:

• Update catalogue index download buttons to use explicit filenames for Metal FARP Lua plugin downloads.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR ensures the Lua plugin download buttons in the docs trigger browser downloads with an explicit and correct filename, aligning the rendered HTML with the intended user-facing behavior. CI, external link handling, and documentation language migration are also adjusted per the description, though only the download attribute change is visible in the provided diff.

Sequence diagram for explicit download filename on Lua plugin button

sequenceDiagram
    actor User
    participant Browser
    participant DocsServer

    User->>Browser: click metal-farp.lua .md-button
    Browser->>DocsServer: GET /downloads/CTLD_metalFarpScene.lua
    DocsServer-->>Browser: 200 CTLD_metalFarpScene.lua
    Browser->>Browser: apply download attribute metal-farp.lua
    Browser-->>User: prompt save dialog with filename metal-farp.lua

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File-Level Changes

Change	Details	Files
Ensure catalogue download buttons force a stable, explicit Lua filename when saving the file from the docs site.	Replace bare download attribute on the Metal FARP download link with an explicit download="metal-farp.lua" value. Keep the underlying href pointing at the CI-populated downloads/CTLD_metalFarpScene.lua path while controlling the user-visible saved filename. Apply the same explicit download filename behavior consistently in both the English and French catalogue index pages.	docs/index.md docs/index.fr.md

Possibly linked issues

• Fix download buttons: same-origin .lua serving and external link tab behaviour #11: PR copies Lua files for same-origin downloads, sets download filenames, and configures external link tab behavior as requested.
• #unknown: PR implements CI copy to docs/downloads, download attribute, and external link behaviors requested in the issue, plus ADR.

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[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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