Update docs on recent features

[daun]

Description

• Document cache option in swup.navigate()
• Document cache key in visit object
• Document to.hash key in visit object
• Add example hook handlers for manipulating the above
• Create API → Markup page to document all DOM attributes for controlling swup behavior
  • Ignoring links
  • Setting custom animations
  • Persisting element state
  • Replacing history entries

Checks

• [x] The PR is submitted to the master branch
• [x] The code was linted before pushing (npm run lint)
• [x] All tests are passing (npm run test)

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[daun]

Added your suggestions :)