Moved all docs from ./docs/ to ./web/documentation/ to be available on the website. No code changes. (0.40.5)

docs/errors-and-diagnostics.md

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-# Errors and Diagnostics
-
-This guide helps you understand common error messages and how to collect useful diagnostics.
-
-## Common error classes
-- Parse errors: syntax/indentation problems detected before execution.
-- Name/lookup errors: missing variables, functions, or modules.
-- Runtime errors: type mismatches, out-of-range access, invalid operations.
-
-## Enabling diagnostics
-- Build with `-DFUN_DEBUG=ON` to enable additional assertions and debug messages (see [build.md](./build.md)).
-- Run with smaller, focused scripts to isolate issues.
-
-## Getting useful reports
-- Capture the minimal script that reproduces the issue.
-- Note your build options and platform.
-- Record the full error output from the CLI (`fun`), including line/column if present.
-
-## Tips
-- Use prints or logging sparingly to narrow down failing code.
-- Start from a passing simple case and add complexity until it breaks.