fix(blog): add workflow & doc & example in push-based metrics collection blog.

[Electronic-Waste]

As @andreyvelich suggested here #155 (comment), I made some changes to the push-based metrics collection blog:

• Explain how to use the new API tune() and report_metrics() briefly
• Add links to the official doc and the related example

/cc @kubeflow/wg-automl-leads @varodrig @franciscojavierarceo

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In response to this:

As @andreyvelich suggested here #155 (comment), I made some changes to the push-based metrics collection blog:

• Explain how to use the new API report_metrics() briefly
• Add links to the official doc and the related example

/cc @kubeflow/wg-automl-leads @varodrig @franciscojavierarceo

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[andreyvelich]

Thanks for the update @Electronic-Waste!
/lgtm
/approve

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