fix: broken links getting started, update some page urls

[dave52]

• fix some broken linking issues
• flatten directories of pages to remove "index" from URLs i.e. .../introduction/getting-started/how-to-get-started/index/ -> .../introduction/getting-started/how-to-get-started/
  • also for consistency with existing folder/file structure
• rename no-nav.njk related components, misleading title, it has a nav just no "side nav"

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[github-actions[bot]]

Alex Recommends Report

Alex recommends the following language changes, but Alex is a regular expression based algorithm, so take them with a grain of salt.

:sparkles: :rocket: :sparkles: Nothing to Report :sparkles: :rocket: :sparkles: