Add missing quotes around some expressions

[DataTriny]

Summary

Adds quotes around expressions in places where they were missing.

Changes

Mostly fixed href attributes of links, errors which are ignored by web browsers. Also fixed alt and title attributes of links inside the social navigation block.

Accessibility

This was my initial motivation for doing this, as missing quotes around alt and title attributes on links inside the social navigation block prevents putting text with spaces.

Type of change

• Bug fix (fixes an issue without altering functionality)
• New feature (adds non-breaking functionality)
• Breaking change (alters existing functionality)
• UI/UX improvement (enhances user interface without altering functionality)
• Refactor (improves code quality without altering functionality)
• Documentation update
• Other (please describe below)

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Checklist

• I have verified the accessibility of my changes
• I have tested all possible scenarios for this change
• I have updated theme.toml with a sane default for the feature
• I have made corresponding changes to the documentation:
  • Updated config.toml comments
  • Updated theme.toml comments
  • Updated "Mastering tabi" post in English
  • (Optional) Updated "Mastering tabi" post in Spanish
  • (Optional) Updated "Mastering tabi" post in Catalan

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[welpo]

Thank you, Arnold!