QUA-1932: Add Lineage Getting Started screenshot and align Next Steps cards

[RafaelOsiro]

Overview

Adds a graph overview screenshot to the Lineage Getting Started page and aligns the Deep Dive Introduction Next Steps cards with the icon convention of their target pages.

Key Changes

• Lineage / Getting Started: added overview screenshot of the lineage graph after the intro paragraph and before the add-on tip.
• Lineage / Deep Dive / Introduction: dropped MDI icons from the Next Steps cards (How Lineage Works, Lineage Sources, Reading the Graph, Field-level Lineage) since the target Deep Dive pages have icon-less H1s.

Pages to Test

• http://localhost:8000/container/lineage/getting-started/ — verify the lineage graph screenshot appears right after the intro paragraph and before the "Lineage is delivered as an add-on" tip; alt text is "Lineage graph overview".
• http://localhost:8000/container/lineage/deep-dive/introduction/#next-steps — verify the four Next Steps cards render without any MDI icon next to their card title.

[greptile-apps]

Greptile Summary

Adds a lineage graph overview screenshot to the Getting Started page, inserted after the introductory paragraph and before the add-on tip. The asset path in the markdown correctly resolves to the newly committed PNG.

• docs/container/lineage/getting-started.md: one new ![Lineage graph overview](...) line added at line 7; relative path ../../assets/container/lineage/getting-started/getting-started-1.png is correct relative to the file's location.
• docs/assets/container/lineage/getting-started/getting-started-1.png: new binary PNG asset added in the matching directory.

Confidence Score: 5/5

Safe to merge — the change is a single image insertion into a documentation page with no logic or configuration touched.

The only changes are a new PNG asset and one markdown image tag. The relative path resolves correctly, the alt text is descriptive, and the image is positioned exactly where the PR description says it should be.

No files require special attention.

Important Files Changed

Filename	Overview
docs/container/lineage/getting-started.md	Adds an image reference after the intro paragraph and before the add-on tip; relative path resolves correctly to the newly added asset.
docs/assets/container/lineage/getting-started/getting-started-1.png	New PNG screenshot of the lineage graph overview; placed in the expected asset directory matching the markdown reference path.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A["# Getting Started with Lineage\n(page title)"] --> B["Intro paragraph\n(what lineage is, roles)"]
    B --> C["![Lineage graph overview]\n(NEW: getting-started-1.png)"]
    C --> D["!!! tip\nLineage add-on note"]
    D --> E["## Deep Dive\n(card grid)"]
    D --> F["## How-tos\n(card grid)"]
    D --> G["## Reference\n(card grid)"]

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