Fix typos, update testing link, and upgrade to Ruby 4.0.1

[lordfolken]

This PR fixes several issues found in the repository:

• Fix typo: CRICITAL → CRITICAL in release post
• Fix typo: relase → release in README
• Fix broken testing build link (Issue Links are outdated for XCSoar-testing (page not found) and nightly-build (404) version #61): Update to https://download.xcsoar.org/testing/
• Upgrade to Ruby 4.0.1 in GitHub Actions workflow and README
• Fix deprecated File.exists? → File.exist? in svgconvert plugin

Fixes #61

Summary by CodeRabbit

• Bug Fixes

  • Fixed deprecated Ruby method call to align with current standards.
  • Corrected multiple typographical errors in documentation and release notes.

• Documentation

  • Updated Docker image version requirement to Ruby 3.4.8.
  • Enhanced testing download link to support all platforms.
  • Improved build workflow with updated tool versions.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[coderabbitai]

Caution

Review failed

The pull request is closed.

📝 Walkthrough

Walkthrough

These changes update Ruby and Docker image versions, replace a deprecated API call with its modern equivalent, correct several typographical errors in documentation, and replace broken testing version links with a generic testing page.

Changes

Cohort / File(s)	Summary
Version & Dependency Updates \.github/workflows/website-deploy.yml, README.md	Updated Ruby version from 3.4.7 to 3.4.8, checkout action version, and Docker image tag from ruby:3.3.5 to ruby:3.4.8
Code Modernization _plugins/svgconvert.rb	Replaced deprecated File.exists? with File.exist? in write path check; no logic changes
Content & Documentation _posts/2024-09-02-xcsoar-7-dot-43-released.md, develop/index.md	Fixed typo "CRICITAL" → "CRITICAL" in blog post; corrected typos "relase" → "release" in README; replaced broken Android-specific testing links with generic testing page reference

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 Whisker-twitching updates bright,
Versions bumped and links made right,
Deprecated calls now cleaned away,
Typos fixed with hopping cheer today! 🥕✨

🚥 Pre-merge checks | ✅ 2 | ❌ 3

❌ Failed checks (3 warnings)

Check name	Status	Explanation	Resolution
Title check	⚠️ Warning	The title claims 'upgrade to Ruby 4.0.1' but the actual changes show downgrade to Ruby 3.4.8 due to dependency incompatibility, making the title misleading.	Correct the title to accurately reflect the actual changes: 'Fix typos, update testing link, upgrade Ruby to 3.4.8, and replace deprecated File.exists?'
Out of Scope Changes check	⚠️ Warning	The PR includes several out-of-scope changes beyond Issue #61: typo fixes in unrelated files, Ruby version updates/downgrades, Jekyll dependency version adjustments, and deprecated API replacements.	Consider separating out-of-scope changes (typos, Ruby/Jekyll updates, API modernization) into a separate PR focused on a single objective, or document why bundled changes are necessary.
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Linked Issues check	✅ Passed	The pull request successfully addresses Issue #61 by replacing the broken Android Play Store link and nightly_builds URL with a functional testing version link on the develop page.

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[coderabbitai]

Actionable comments posted: 1

🤖 Fix all issues with AI agents

In `@Gemfile`:
- Line 10: The Gemfile requires jekyll "~> 4.4" but Gemfile.lock pins jekyll to
a narrower "~> 4.4.0", causing Bundler CI to fail; update the lockfile by
running `bundle lock --update jekyll` (or `bundle install`) locally to
regenerate Gemfile.lock to match the Gemfile constraint, then commit the updated
Gemfile.lock so the CI bundler-cache check succeeds.