refactor: remove user docs (backport #18373)

[mergify]

This is an automatic backport of pull request #18373 done by Mergify.
Cherry-pick of fb9dadc has failed:

On branch mergify/bp/release/v0.50.x/pr-18373
Your branch is up to date with 'origin/release/v0.50.x'.

You are currently cherry-picking commit fb9dadc00.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by them: docs/docs/user/run-node/00-keyring.md
	deleted by them: docs/docs/user/run-node/01-run-node.md
	deleted by them: docs/docs/user/run-node/02-interact-node.md
	deleted by them: docs/docs/user/run-node/03-txs.md
	deleted by them: docs/docs/user/run-node/05-run-testnet.md
	deleted by them: docs/docs/user/run-node/06-run-production.md
	deleted by them: docs/docs/user/run-node/_category_.json
	both modified:   docs/post.sh
	both modified:   docs/pre.sh

no changes added to commit (use "git add" and/or "git commit -a")

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[julienrbrt]

@samricotta could you please fix the conflicts here :) ?

[julienrbrt]

conflicts

[tac0turtle]

touched base with sam, she mentioned this doesnt need to be backported