Documentation consistency review: fix formatting, update HTTP→HTTPS

[Copilot]

Conducted systematic review of 62 documentation files to identify and fix consistency issues. Found documentation in good shape overall—no systematic problems, just minor formatting and security improvements needed.

Fixes

• Trailing whitespace: Removed 141 instances across 19 files
• HTTP→HTTPS: Updated 22 insecure links (nvie.com, cmake.org, git-scm.com, openswath.org, doi.org, pubmed.ncbi.nlm.nih.gov, etc.)
• Broken link: Fixed malformed Microsoft docs URL in Windows installation guide
• TODO comments: Removed 2 from production docs

Files Modified

23 existing documentation files updated with minimal, targeted fixes:

• Installation guides (macOS, Windows, conda)
• Learning materials and background docs
• Getting started guides
• Manual sections (contribute, develop)
• KNIME tutorials

Verification

• ✅ Documentation builds successfully with make html
• ✅ All changes maintain backward compatibility
• ✅ Only existing files modified

The changes improve documentation professionalism and security through minimal fixes to existing files.

Original prompt

check the documentation for consistence and suggest improvements

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[timosachsenberg]

accidently added @singjc ignore

[timosachsenberg]

@copilot don't add new files

[Copilot]

@copilot don't add new files

Removed all new files. The PR now only contains fixes to existing documentation files (23 files modified). Changes include:

• Trailing whitespace removal
• HTTP→HTTPS updates
• Fixed broken links
• Removed TODO comments

Commit: dc23b6c