llama : move end-user examples to tools directory (#13249)

* llama : move end-user examples to tools directory

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Co-authored-by: Xuan Son Nguyen <son@huggingface.co>

tools/server/themes/README.md

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+# LLaMA.cpp Server Wild Theme
+
+Simple themes directory of sample "public" directories. To try any of these add --path to your run like `server --path=wild`.
+
+![image](wild/wild.png)

tools/server/themes/buttons-top/README.md

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+# LLaMA.cpp Server Buttons Top Theme
+
+Simple tweaks to the UI. Chat buttons at the top of the page instead of bottom so you can hit Stop instead of chasing it down the page.
+
+To use simply run server with `--path=themes/buttons_top`
+
+![image](buttons_top.png)

tools/server/themes/wild/README.md

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+# LLaMA.cpp Server Wild Theme
+
+Simple tweaks to the UI. To use simply run server with `--path=themes/wild`
+
+![image](wild.png)