Add Stable Diffusion web UI example (#63)

* Add stable-diffusion-webui example

* Add Stable Diffusion web UI example

* fix lint

advanced/stable-diffusion-webui/README.md

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+# Stable Diffusion web UI
+
+[Stable Diffusion web UI](https://github.com/AUTOMATIC1111/stable-diffusion-webui.git) is a browser interface based on Gradio library for Stable Diffusion.
+
+## Install Lepton sdk
+```shell
+pip install leptonai
+```
+
+## Launch Stable Diffusion web UI in the cloud
+
+Similar to other examples, you can run Stable Diffusion web UI on Lepton Cloud Platform easily, e.g.:
+
+```shell
+lep photon create -n stable-diffusion-webui -m photon.py
+lep photon push -n stable-diffusion-webui
+lep photon run \
+    -n stable-diffusion-webui \
+    --resource-shape gpu.a10
+    --public
+```
+
+You can visit [dashboard.lepton.ai](https://dashboard.lepton.ai/) to use the web Dashboard, or use `lep` cli to manage the launched deployment:
+```shell
+lep deployment status -n stable-diffusion-webui
+```
+
+## Client
+
+Once the Stable Diffusion web UI server is up, you can copy the deployment url shown on the Lepton Dashboard (or in the `lep` cli output)
+
+<img src="assets/deployment.png" width=1024>
+
+and visit it in the web browser
+
+<img src="assets/browser.png" width=1024>

advanced/stable-diffusion-webui/photon.py

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+import os
+
+from leptonai.photon import Photon
+
+
+class WebUI(Photon):
+    webui_version = "1.6.0"
+    cmd = [
+        "bash",
+        "-c",
+        (
+            "apt-get update && apt-get install -y wget libgoogle-perftools-dev && wget"
+            f" -q https://raw.githubusercontent.com/AUTOMATIC1111/stable-diffusion-webui/{webui_version}/webui.sh"
+            " && chmod +x ./webui.sh && ACCELERATE=True ./webui.sh -f --listen --port"
+            " 8080"
+        ),
+    ]
+    deployment_template = {
+        "resource_shape": "gpu.a10",
+    }