docs(getting-started): fix accuracy and tighten prose

[davd-gzl]

Follow-up to #5746 to remove awkward phrasing and factual mistakes.

• correct stdlib/import, installer, crossing-function, Render, linter, and namespace claims against the actual codebase
• rename "Run locally with gnodev" to "Build and run locally" and number both tutorial sections
• restructure intro and section openers; replace em-dashes with plain punctuation
• install.md: gnodev version -> gnodev --help (no such subcommand)

[Gno2D2]

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[alexiscolin]

LGTM on the substance. The factual fixes are exactly the kind of catches that matter for newcomers (gnodev version → --help, the Increment(cross(cur)) framing, the gno-interrealm-v2 link, removing "dead code" from the lint description). Numbered steps in the tutorial are a clear UX win and align with the convention used by most onboarding docs out there. "Build and run locally" captures what the section actually does better than the old title. +1 on dropping em-dashes for plainer punctuation: easier for non-native readers, and — has become a noisy LLM tell anyway.

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