[DOCS] vision apps index summary added

Import Userrequested to merge
github/fork/mpytlik-intel/vision-index-summary into main

Description

Added summary of Industrial Edge Insights Vision Apps on vision apps landing page.

Checklist:

  • I agree to use the APACHE-2.0 license for my code changes.
  • I have not introduced any 3rd party components incompatible with APACHE-2.0.
  • I have not included any company confidential information, trade secret, password or security token.
  • I have performed a self-review of my code.

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