Follow-up: remove legacy _tools and unused minima dependency

[lordfolken]

Summary

• remove legacy _tools/ scripts/templates that are no longer referenced by build/deploy flows
• remove unused minima gem from Gemfile
• refresh Gemfile.lock and update internal structure docs accordingly

Test plan

• docker run --rm --network host -v \"$PWD:/data\" -w /data ruby:4 bash -lc \"bundle install\"
• docker run --rm --network host -v \"$PWD:/data\" -w /data ruby:4 bash -lc \"bundle install && bundle exec jekyll build --future\"

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 30f11f2f-8869-438f-b778-41b6e50fee57

📥 Commits

Reviewing files that changed from the base of the PR and between cf521b6 and 3ea4a27.

⛔ Files ignored due to path filters (1)

• Gemfile.lock is excluded by !**/*.lock

📒 Files selected for processing (9)

• Gemfile
• _tools/fabfile.py
• _tools/ftp_index/create_ftp_index.py
• _tools/ftp_index/create_local_index.py
• _tools/ftp_index/file.tpl
• _tools/ftp_index/index.tpl
• _tools/ftp_index/readme.tpl
• _tools/ftp_index/subdir.tpl
• docs/internal/WEBSITE_STRUCTURE.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/reduce-build-complexity

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