docs: updates for release-24.3 (#29)

* docs: update demos, add install instructions, use Sentence case
headings, update product images.

* apply sentence case

* docs(signal-processing): add missing ref

* docs(airflow-scheduled-job): update images for new product version

* docs(airflow-scheduled-job): fix images

* docs(airflow-scheduled-job): replace logging section which doesn't work with the KubernetesExecutor

* Apply suggestions

Co-authored-by: Andrew Kenworthy <[email protected]>

* Apply suggestions

Co-authored-by: Andrew Kenworthy <[email protected]>

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Co-authored-by: Andrew Kenworthy <[email protected]>

Author: NickLarsenNZ