Update installation instructions for Corepack and PNPM

[hichemfantar]

Revise the installation instructions to include enabling Corepack and provide guidance for installing it if the command fails. Clarify the steps for installing workspace dependencies with PNPM.

i had this idea because corepack failed to install the latest version of pnpm due to it being out of date

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Latest commit: 0a6840a

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[dimaMachina]

Great contribution, thanks!

[hichemfantar]

@dimaMachina i hope you’re using corepack because it’s super useful

[dimaMachina]

@dimaMachina i hope you’re using corepack because it’s super useful

@hichemfantar Yep, I love it!