Fix Hugo inline SVG parsing in Platform Engineering docs diagram

[Copilot]

The Platform Engineering docs page rendered the new IDP flow diagram incorrectly because Hugo/Goldmark parsed the SVG body as an indented code block. This update ensures the diagram is emitted as actual SVG elements so the visual flow renders in-page.

• Problem scope

  • Updated only hugo-docs/content/docs/platform-engineering/_index.md, where the broken diagram markup lives.

• Markup fix

  • Reworked the inline SVG block formatting to prevent Markdown code-block interpretation inside <svg>.
  • Preserved the existing diagram content (nodes, connectors, labels, and sequence footer) without changing the conceptual flow.

• Resulting HTML behavior

  • SVG children now render as normal DOM elements (<rect>, <line>, <polygon>, <text>) rather than being wrapped in <pre><code>.

<div style="overflow-x:auto; margin: 1rem 0;">
<svg viewBox="0 0 1180 430" ...>
<rect x="30" y="60" ... />
<text x="120" y="92" ...>Templates</text>
...
</svg>
</div>