docs: use static star-history chart image

Author: Arman-Luthra

README.md

@@ -460,12 +460,8 @@ BSD-3-Clause for the Fortress patches and tooling (matching Chromium). Chromium
 
 Detection keeps moving, so a stealth engine is only as good as its last rebase. Fortress tracks the latest Chromium monthly, re-runs the full gauntlet, and ships a patch whenever a detector finds a new tell, so what you run keeps matching what a real Chrome install looks like. [Watch the releases](https://github.com/tiliondev/fortress/releases) to follow the `v2` MaskConfig work, or [star the repo](https://github.com/tiliondev/fortress/stargazers) if it's useful to you.
 
-<a href="https://www.star-history.com/?repos=tiliondev%2Ffortress&type=date&logscale=&legend=top-left">
- <picture>
-   <source media="(prefers-color-scheme: dark)" srcset="https://api.star-history.com/chart?repos=tiliondev/fortress&type=date&theme=dark&logscale&legend=top-left" />
-   <source media="(prefers-color-scheme: light)" srcset="https://api.star-history.com/chart?repos=tiliondev/fortress&type=date&logscale&legend=top-left" />
-   <img alt="Star History Chart" src="https://api.star-history.com/chart?repos=tiliondev/fortress&type=date&logscale&legend=top-left" />
- </picture>
+<a href="https://www.star-history.com/#tiliondev/fortress&Date">
+  <img alt="Star History Chart" src="docs/assets/star-history.png" width="600" />
 </a>
 
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