Updates to the CLI installation guide

[pwizla]

Direct preview link 👉 here

This PR:

• reworks the CLI installation guide to mention the new commands and all the (new or updated) possible options. (Note: All options are now documented in the CLI installation guide and not in the CLI reference, as the only place where options (like --debug, --db-username etc.) were documented was for the strapi new command but this command has been removed from v5.
• slightly rework the Quick Start Guide as the command is now shorter: create-strapi-app → create-strapi

Related strapi/strapi PR: https://github.com/strapi/strapi/pull/20268

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Name	Status	Preview	Comments	Updated (UTC)
documentation	❌ Failed (Inspect)			Jun 12, 2024 1:15pm