docs: tidy up website tooling and repo config

[vdusek]

Website tooling and repo config cleanup, same as crawlee-python#2327 and apify-client-python#1126.

• Website code is linted with type-aware oxlint (new website/tsconfig.json), and warnings fail CI. Fixed the few issues it found.
• Removed unused website deps and aligned version ranges with the lockfile.
• YAML: 2-space indent, no quotes unless needed, double quotes when they are.
• markdownlint: default 2-space list indent (as in apify-docs) and fenced code blocks only.
• Fixed the .editorconfig YAML glob.

✍️ Drafted by Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.05%. Comparing base (3ed1a48) to head (5b94e5f).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1181   +/-   ##
=======================================
  Coverage   93.05%   93.05%           
=======================================
  Files          54       54           
  Lines        3671     3671           
=======================================
  Hits         3416     3416           
  Misses        255      255           

Flag	Coverage Δ
e2e	31.73% <ø> (ø)
integration	51.70% <ø> (ø)
unit	89.78% <ø> (ø)

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[apify-approval-mirror]

Mirroring approval from @Mantisus.