* clarify subkey read in GUI
* add screenshots
* add to index
* update kv nav steps
* update alt text for screenshot
* update steps
* edits
* fix build error and simplify path structure
* fix paths
* missed one
* missed another one >_<
* Update website/content/docs/secrets/kv/kv-v2/cookbook/write-data.mdx
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Co-authored-by: Sarah Chavis <62406755+schavis@users.noreply.github.com>