George Kalpakas 64efe38d66 fix(docs-infra): merge docs with guide and start with tutorial in search-results (#40881)
Previously, the `docs.md` guide was appearing under "OTHER" in search
results and the results for the `/start*` tutorial pages were appearing
under "START".

This commit changes this so that `docs.md` appears under "GUIDES" and
`/start*` appear under "TUTORIALS", since that is where they belong
conceptually.

It also changes the header of the guides search-area from "GUIDE" to
"GUIDES" and that of tutorials from "TUTORIAL" to "TUTORIALS".

Before: ![search-results areas before][1]
After: ![search-results areas after][2]

[1]: https://user-images.githubusercontent.com/8604205/107811568-0ce80480-6d77-11eb-8652-e7a947c36e63.png
[2]: https://user-images.githubusercontent.com/8604205/107811569-0eb1c800-6d77-11eb-9a69-0000a3703c8a.png

PR Close #40881
2021-02-19 09:14:59 -08:00
..