docs: document slim Docker images and package manager setup

[vladfrangu]

Mirrors apify/crawlee#4082 for the Actor Dockerfile page:

• Document the -slim tag variants (no preinstalled apify/crawlee/typescript) in the Node.js base images section and the tag naming convention, and recommend them by default.
• New Package managers section: Corepack enabled (no package manager besides npm preinstalled), packageManager support, flat node_modules linker config, /pkg-cache, and how to override the linker via ENV.
• Supported Node.js versions are now 22, 24 and 26. Example Dockerfiles on the Dockerfile, source code, performance and academy pages bumped from :16/:20 to :24.

[🤖] Claude Code using Fable 5

[apify-service-account]

🗑️ Preview for this PR was deleted.

[honzajavorek]

Thanks for visiting our docs monastery with the gift of new content! It looks good, but I dropped a few comments so that the resulting document is more coherent, at least according to my humble opinion.

I also feel that even if all my comments are addressed, the document as a whole kind of jumps from general advice to Node.js advice, then to general advice, then to Python advice, then back to Node.js advice, and so on. But I don't know if I'm to poke into that right now. Leaving it up to you, if you feel like the sections could use a better sorting, when you glance over their order.

[vladfrangu]

Regrouping the page by scope is in #2964, stacked on this one, so it can be reviewed separately.

[🤖] Claude Code using Fable 5

[honzajavorek]

Awesome, thank you!