Add fromTemplate to TypeScript docs and restructure base image section

docs/template/base-image.mdx

@@ -28,65 +28,79 @@
 **File ignoring**: The SDK automatically reads `.dockerignore` files and combines them with your `fileIgnorePatterns` (TypeScript) or `file_ignore_patterns` (Python). Files matching these patterns are excluded from uploads and hash calculations.
 
 ## Defining base image
-Choose from predefined base images or use custom ones:
+
+Every template starts with a base image that provides the foundation for your sandbox environment.
+
+### Predefined base images
+
+Use convenience methods for common base images with Ubuntu, Debian, Python, Node.js, or Bun:
 
 <CodeGroup>
 
 ```typescript JavaScript & TypeScript
-// Predefined base images
-template.fromUbuntuImage("jammy"); // ubuntu:jammy
 template.fromUbuntuImage("22.04"); // ubuntu:22.04
 template.fromDebianImage("stable-slim"); // debian:stable-slim
-template.fromDebianImage("bullseye"); // debian:bullseye
 template.fromPythonImage("3.13"); // python:3.13
-template.fromPythonImage("3.11"); // python:3.11
 template.fromNodeImage("lts"); // node:lts
-template.fromNodeImage("20"); // node:20
 template.fromBunImage("1.3"); // oven/bun:1.3
-
-// Custom base image
-template.fromImage("custom-image:latest");
-
-// Use default E2B base image
-template.fromBaseImage(); // e2bdev/base
-
-// Parse existing Dockerfile
-const dockerfileContent = `
-FROM node:18-alpine
-WORKDIR /app
-COPY package*.json ./
-RUN npm ci --only=production
-COPY . .
-ENV NODE_ENV=production`;
-
-template.fromDockerfile(dockerfileContent);
 ```
 
 ```python Python
-# Predefined base images
-template.from_ubuntu_image("jammy")  # ubuntu:jammy
 template.from_ubuntu_image("22.04")  # ubuntu:22.04
 template.from_debian_image("stable-slim")  # debian:stable-slim
-template.from_debian_image("bullseye")  # debian:bullseye
 template.from_python_image("3.13")  # python:3.13
-template.from_python_image("3.11")  # python:3.11
 template.from_node_image("lts")  # node:lts
-template.from_node_image("20")  # node:20
 template.from_bun_image("1.3")  # oven/bun:1.3
+```
+
+</CodeGroup>
+
+### Custom base image
+
+Use any Docker image from Docker Hub or other registries:
+
+<CodeGroup>
+
+```typescript JavaScript & TypeScript
+template.fromImage("custom-image:latest");
+```
 
-# Custom base image
+```python Python
 template.from_image("custom-image:latest")
+```
+
+</CodeGroup>
+
+### Default E2B base image
+
+Use the default E2B base image, which comes pre-configured for sandbox environments:
+
+<CodeGroup>
+
+```typescript JavaScript & TypeScript
+template.fromBaseImage(); // e2bdev/base
+```
 
-# Use default E2B base image
+```python Python
 template.from_base_image()  # e2bdev/base
+```
+
+</CodeGroup>
+
+### Build from existing template
+
+Extend an existing template from your team or organization:
+
+<CodeGroup>
+
+```typescript JavaScript & TypeScript
+template.fromTemplate("my-template"); // Your team's template
+template.fromTemplate("acme/other-template"); // Full namespaced reference
+```
 
-# Build from existing template
+```python Python
 template.from_template("my-template")  # Your team's template
 template.from_template("acme/other-template")  # Full namespaced reference
-
-# Parse and build from Dockerfile
-template.from_dockerfile("Dockerfile")
-template.from_dockerfile("FROM ubuntu:22.04\nRUN apt-get update")
 ```
 
 </CodeGroup>
@@ -95,9 +109,9 @@
 You can only call base image methods once per template. Subsequent calls will throw an error.
 </Note>
 
 ## Parsing existing Dockerfiles
 
 Convert existing Dockerfiles to template format using `fromDockerfile()`:
 
 <CodeGroup>
 
@@ -136,7 +150,7 @@
 
 </CodeGroup>
 
 ### Dockerfile instructions support
 
 | Instruction          | Supported  | Behavior                                                                                          |
 | :---                 |    :----:  | :---                                                                                              |