More advanced topics in Python: Add uproot and links to documentation

[kauniska]

Edit text in chapter "More advanced topics in Python": Add uproot to the list (root_numpy is deprecated). Add links to package documentation and webpages.

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[stale]

This issue or pull request has been automatically marked as stale because it has not had recent activity. Please manually close it, if it is no longer relevant, or ask for help or support to help getting it unstuck. Let me bring this to the attention of @klieret @wdconinc @michmx for now.

[jonas-eschle]

Hey thanks a lot, sorry for this having been staled. LGTM!

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