DOCS-159 - Rework Explore article

[jpipkin1]

Purpose of this pull request

This pull request reworks this article in preparation for Kanso: https://help.sumologic.com/docs/dashboards/explore-view/

It also updates all references to the Explore feature, since Explore is replaced in Kanso with the **Infrastructure Monitoring" and "Application Monitoring" menus.

Select the type of change

• [ ] Minor Changes - Typos, formatting, slight revisions
• [x] Update Content - Revisions, updating sections
• [ ] New Content - New features, sections, pages, tutorials
• [ ] Site and Tools - .clabot, version updates, maintenance, dependencies, new packages for the site (Docusaurus, Gatsby, React, etc.)

Ticket (if applicable)