internal/search: fix stdlib grouping

Fix a bug that resulted in net/http/prof not being grouped with
net/http.

The bug arose from a mistake in extracting the top-level directory
from a stdlib package path. After coming across the proposal for
`strings.Cut` (https://golang.org/issue/46336), I was on the fence
about adding a copy to this repo and using it here. Ultimately I
decided that the job was simple enough to do without it.

I was wrong. So this CL adds `Cut` and uses it here. We can
incremently use it in other places where it simplifies things.

Change-Id: I804aea93f3850bba52d9e0edde8ea136746093f8
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/347555
Trust: Jonathan Amsterdam <jba@google.com>
Run-TryBot: Jonathan Amsterdam <jba@google.com>
TryBot-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Julie Qiu <julie@golang.org>
3 files changed
tree: c126567a8f3ec97e98acca824649bdcbc6876534
  1. cmd/
  2. devtools/
  3. doc/
  4. internal/
  5. migrations/
  6. static/
  7. tests/
  8. third_party/
  9. .dockerignore
  10. .eslintignore
  11. .eslintrc.yaml
  12. .gitignore
  13. .prettierignore
  14. .prettierrc.yaml
  15. .stylelintignore
  16. .stylelintrc.yaml
  17. all.bash
  18. cloudbuild.yaml
  19. CONTRIBUTING.md
  20. go.mod
  21. go.sum
  22. jest.config.js
  23. LICENSE
  24. package-lock.json
  25. package.json
  26. PATENTS
  27. README.md
  28. tsconfig.json
README.md

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