Create new landing page for sagemaker python sdk

[Aditi2424]

What did you find confusing? Please describe.
The landing page https://sagemaker.readthedocs.io/en/stable/ is very text heavy and does not components and features, installation guide, etc.

Describe how documentation can be improved
summarize the
Components - Training (Debugger)
MLOps
SageMaker Core
Inference
Jumpstart

and
SDK Features -
Intelligent Defaults
Local Mode

Create a quickstart guide and installation steps

Additional context
Add any other context or screenshots about the documentation request here.

[amazon-q-developer]

✅ I finished the proposed code changes, and the pull request is ready for review: #2.

Comment on the pull request to provide feedback and request a new iteration.

[amazon-q-developer]

⏳ I'm working on generating code for this issue. I'll update this issue with a comment and open a pull request when I'm done.

[amazon-q-developer]

I'm getting ready to upgrade your code to Java 17.

[amazon-q-developer]

I'm running the GitHub Actions workflow required to transform your code.

[amazon-q-developer]

Before I can start on the transformation request, you need to enable GitHub Actions for this repository, and you need at least one runner online.

To upgrade your code, complete the following steps:

1. Ensure GitHub Actions is enabled for this repository.
2. Ensure at least one runner is online.
3. Modify your config file within the .github/workflows/ path to include the following snippet (customize verify step):

name: Q Code Transformation

on:
  push:
    branches:
      - 'Q-TRANSFORM-issue-*'

jobs:
  q-code-transformation:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
      - uses: actions/setup-java@v3
        with:
          java-version: '17'
          distribution: 'adopt'

      - name: Build and copy dependencies
        run: |
          mvn ${{ env.MAVEN_CLI_OPTS }} verify
          mvn ${{ env.MAVEN_CLI_OPTS }} dependency:copy-dependencies -DoutputDirectory=dependencies -Dmdep.useRepositoryLayout=true -Dmdep.copyPom=true -Dmdep.addParentPoms=true

      - name: Upload artifacts
        uses: actions/upload-artifact@v4
        with:
          name: q-code-transformation-dependencies
          path: dependencies

4. Merge or commit the changes to your repository's default branch.
5. Return to this issue and restart the transformation action by applying the Amazon Q transform agent label. If the label is already applied, remove it and re-apply.

For more information, see managing workflow runs in the GitHub documentation.