Centralize codespell config and add 1 more fix

[yarikoptic]

Made codespell to be usable standalone and aggregated and expanded its config.
Also found/fixed 1 extra typo

Changes

Configuration & Infrastructure

• fa1130d Add github action to codespell main on push and PRs
• 966990b Add rudimentary codespell config
• 408c0a1 Consolidate codespell config into pyproject.toml for standalone use

What the consolidated config does

• pyproject.toml is now the single source of truth — run codespell or uvx codespell standalone
• Pre-commit hook updated to use pyproject.toml config (removed custom args overrides), bumped to v2.4.1
• Removed .codespell-ignore-words.txt (had merge conflict markers; contents merged into pyproject.toml)

Skip patterns

• *.bib (author surnames cause false positives), *.png (embedded text), *.scss
• _extensions (third-party Quarto extension code with German variable names)
• socratiQ (bundled JS), build outputs (_site, _book, htmlcov), caches (.cache, .npm)

Exclusions relaxed vs old pre-commit config

• *.json — only .all-contributorsrc skipped now (not all JSON)
• *.js — only socratiQ skipped now (not all JS)
• *.tex — only _extensions skipped now (not all TeX)

Ignore patterns

• camelCase/PascalCase regex for code identifiers (TikZ labels like ALine, LineZ, localY)
• URL regex to protect links from corrections
• 27 documented words in ignore-words-list (contributor names, abbreviations, domain terms)

Typo fix

• akumulators → accumulators in inject_quizzes.lua

Testing

✅ uvx codespell passes with zero errors

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