docs: install cypress via pnpm

[inblossoms]

This PR is related to #27419.

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[inblossoms]

@MikeMcC399

ugh, I misinterpreted your meaning and submitted the PR.
Thank you again for pointing out the problem to me.
I wonder if I need to turn it off, but this PR might be useful for users like me.

[inblossoms]

uh-huh, Do I need to change it to 'pnpm install cypress --dev'? The 'pnpm install cypress --dev' approach is not desirable in my use. It is also because of this way of initializing Cypress that I submit this issue.
It is a good idea to provide the installation steps by tabbing or updating the video, maybe I can give it a try.
I may need to sign the CLA later, as you said, if I want this PR to be accepted.
(I have benefited a lot from talking with you.)

[inblossoms]

Installing cypress into package.json's devDependencies aligns to the Getting Started instructions for npm and yarn. Getting Started is not intended to cover all use cases though. Why was 'pnpm install cypress --dev' not right for you?

I don't know why, but it takes more than twenty minutes to install with 'pnpm install cypress -D' (as I recall), but only 10-20 seconds with npm. Moreover, the project completed by pnpm installation lost the test case, so I need to install the patch of the use case again for the test case.

[inblossoms]

pnpm install cypress --save-dev works, which conflicts with the pnpm documentation.

When I found that I could not install it correctly through 'pnpm', I wondered if it was related to the underlying implementation of pnpm.
Now I can stop caring so much about it.

[MikeMcC399]

@inblossoms

Apologies for my confusion between pnpm add and pnpm install !
I need to review my comments now, since I got this wrong.

[inblossoms]

Hi @MikeMcC399

add or install, I am very terrible at using pnpm. You're just trying to clear my mind. thanks for you.