Clarify image paths for nested assets

[hamedrabah]

Documentation changes

Clarifies how to keep images beside related pages while using Mintlify root-relative paths:

• Shows a nested guides/assets directory example.
• Provides the exact path to use from MDX.
• States that no global image-directory setting is required.

Closes #175

Validation

• mint validate --telemetry=false
• mint broken-links --files create/image-embeds.mdx --telemetry=false
• git diff --check

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Note

Low Risk
Documentation-only clarification in create/image-embeds.mdx; no product or runtime behavior changes.

Overview
Expands the “Basic image syntax” section in create/image-embeds.mdx so authors can colocate images (e.g. guides/assets/ next to setup.mdx) without guessing how paths work.

The new copy adds a sample repo tree, shows the MDX path /guides/assets/setup-dialog.png from any page, and states that no global image-directory setting is required—still using repository root-relative paths only (not ./ relative paths).

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