fix: Repair CI — ruff format drift and broken .NET doc image links

[DaveSkender]

Fixes both CI failures in this repo. They are unrelated to each other and neither was caused by a code change here — both are external drift that turned every PR red.

1. lint-and-test → Ruff format check

requirements-test.txt pins no ruff version, so CI installs the newest release. Ruff 0.16 formats Python code blocks embedded in Markdown, pulling docs/**/*.md into ruff format --check for the first time. 23 doc files had never been formatted.

Verified against the version CI uses (ruff 0.16.0): 23 files would be reformatted → 304 files already formatted. ruff check . passed throughout — lint was never the problem.

Every edit is inside a fenced ```python block; no prose, front matter, or fence lines touched. Several are real improvements to the examples:

• stray C#-style semicolons removed — indicators.get_doji(quotes); → indicators.get_doji(quotes)
• argument spacing — get_kama(quotes, 10,2,30) → get_kama(quotes, 10, 2, 30)
• PEP 8 blank lines before class, and [ x for ... ] → [x for ...]

2. test → Test for broken URLs (83 HTML-Proofer failures)

DaveSkender/Stock.Indicators was renamed to facioquo/stock-indicators-dotnet, and its v3.0.0 VitePress migration (896ae089) deleted docs/assets/charts/, renaming the surviving images to kebab-case. raw.githubusercontent.com does not follow repo renames, so all 82 chart images plus examples.webp began returning 404.

Repointed site.dotnet.charts to d0b99458 — the last commit carrying the complete PascalCase set. All 82 URLs plus examples.webp verified returning HTTP 200.

A pinned commit rather than main is deliberate: four referenced images (AdIndex, Correlation, HeikinAshi, StdDevChannelsFull) have no equivalent in the current tree, so pointing at today's kebab-case assets would still leave four broken links and require deciding what to show instead. That is a docs-content call, not a CI fix. Also updated the stale repo/src URLs to the new org.

Follow-ups worth considering

• Unpinned linter: a future ruff release can redden every PR with no commit. Pin ruff (with Dependabot) or exclude docs/** from formatting.
• Chart images: to track the .NET repo's live assets, the 78 that survived need PascalCase → kebab-case remapping, and the 4 orphans need a decision.
• Prose links to github.com/DaveSkender/Stock.Indicators/discussions in contributing.md are left alone — github.com does follow renames, so they resolve and pass.

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