The IsNode method on a Page object returns true if the [page kind] is home, section, taxonomy, or term.
It returns false is the page kind is page.
content/
├── books/
│ ├── book-1/
│ │ └── index.md <-- kind = page, node = false
│ ├── book-2.md <-- kind = page, node = false
│ └── _index.md <-- kind = section, node = true
├── tags/
│ ├── fiction/
│ │ └── _index.md <-- kind = term, node = true
│ └── _index.md <-- kind = taxonomy, node = true
└── _index.md <-- kind = home, node = true
{{ .IsNode }}