simplify SageMaker docs

[jameslamb]

Contributes to #402.

Contributes to #382 (by removing an image with a reference to the no-longer-supported rapidsai/core Docker image).

The main purpose of this PR is to reduce duplication in the SageMaker example at https://docs.rapids.ai/deployment/nightly/cloud/aws/sagemaker/. If you read that page from top to bottom, today it feels like 2 very-similar pages that were concatenated together. Details like starting a SageMaker Notebook instance and setting up a lifecycle configuration are repeated.

It also contains an incomplete example of how to use SageMaker Estimators. This proposes replacing that and instead encouraging the use of https://docs.rapids.ai/deployment/nightly/examples/rapids-sagemaker-higgs/notebook/, which contains an end-to-end complete example of using SageMaker Estimators.

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[jameslamb]

This was just incorrect. Those buckets exist and data exists there, but not any datasets references in this document or the things it links to.

We can safely remove this... the Higgs notebook linked to in this doc handles downloading a dataset and putting it up on S3 itself.

deployment/source/examples/rapids-sagemaker-higgs/notebook.ipynb

Lines 92 to 106 in 3578ead

	"source": [
	"!mkdir dataset\n",
	"!wget -P dataset https://archive.ics.uci.edu/ml/machine-learning-databases/00280/HIGGS.csv.gz\n",
	"!gunzip dataset/HIGGS.csv.gz"
	]
	},
	{
	"cell_type": "code",
	"execution_count": 6,
	"metadata": {
	"tags": []
	},
	"outputs": [],
	"source": [
	"s3_data_dir = session.upload_data(path=\"dataset\", key_prefix=\"dataset/higgs-dataset\")"

[jameslamb]

{{ rapids_container }} is already templated into this estiamtor_info dictioanry a few lines up.

Just using a dictionary reference here instead of repeating the templating reduces the risk of inconsistencies, and makes interactive testing (where I found it convenient to git clone the repo and manually replace these with different image tags) a bit easier.

[jacobtomlinson]

This is great thanks @jameslamb