README: drop the Docs section

docs/ is internal design and porting notes, not end-user documentation, so
the README should not send readers there. Put it back when there are docs
worth linking.

Removed the section and the two inline pointers that fed the same files
(-> docs/GRAPH_VIEW.md on Graph, -> docs/RPC.md on RPC), since the reason
applies to those equally. No docs/ reference remains.

Kept, deliberately, two links that are not end-user docs:
  * .agents/skills/idatui/SKILL.md -- promoted from a subsection of Docs to
    its own heading so removing the parent did not silently delete the only
    pointer to the skill we just shipped;
  * .fastfeedback/SPEED.md -- contributor-facing, sits inside Tests next to
    the commands it qualifies, and is accurate.
Say the word if either should go too.

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