Rework CYPRESS_RUN_BINARY instructions

[MikeMcC399]

Issue

Advanced Installation > Run binary includes instructions for using the environment variable CYPRESS_RUN_BINARY to override where the npm module finds the Cypress binary.

1. The instructions to run Cypress do not work as written. The package manager prefix npx, yarn or pnpm is missing and there is no hint that this would be needed.
2. There are no instructions about how to unzip the Cypress binary cypress.zip. Depending on how the extract or unzip operation is performed, there may be an extra directory level created. On Linux, for instance, this could mean that it is necessary to set the environment variable to CYPRESS_RUN_BINARY=~/Downloads/cypress/Cypress/Cypress instead of CYPRESS_RUN_BINARY=~/Downloads/Cypress/Cypress. This is quite confusing considering the multiple use of the names cypress and Cypress as directories and Cypress as an executable.
3. If the unzipped binary is located in a read-only location, then Cypress may fail to verify and therefore fail to run (see issue Cypress fails verification if directory for binary_state.json is read-only cypress#30684). There is no mention of this issue or a possible workaround.
4. As written, the cautionary message, advising against exporting the CYPRESS_RUN_BINARY environment variable, does not make a lot of sense.

Change

The instructions in Advanced Installation > Run binary for using the environment variable CYPRESS_RUN_BINARY are reworked.

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[jennifer-shehane]

Nice!