Remaining cleanup items from #17007

[dedemorton]

These tasks are remaining from the work started in #17007:

• Update links:
  • apm-server Change links to refactored Beats getting started docs apm-server#3939
  • security-docs Change links to refactored Beats getting started docs security-docs#43
  • stack-docs Change links to refactored Beats getting started docs stack-docs#1234
  • kibana (includes uptime docs) [DOCS] Update links to Beats documentation kibana#70380
  • observability-docs - Change links to refactored Beats getting started docs observability-docs#15
  • logstash - [DOCS] Change links to refactored Beats getting started docs logstash#12068
  • logstash-docs - created issue - Update links to Filebeat docs logstash-plugins/logstash-input-log4j#45
  • elasticsearch - [DOCS] Change links to refactored Beats getting started docs elasticsearch#58790
  • cloud - https://github.com/elastic/cloud/pull/61452
• Set up redirects (see redirects.asciidoc for the list). See https://github.com/elastic/website-www.elastic.co/issues/6371.
• Update commands to show sudo only when necessary. (Current docs are a mix and a bit consistent.)

[elasticmachine]

Pinging @elastic/integrations (Team:Integrations)

[dedemorton]

Created #19575 to track the addition of tabbed panels to other topics. We want to hold off until we get some user feedback before we propagate the widgets to other docs.

[dedemorton]

Created #19577 to track work needed to make the What's Next section more graphical.

[dedemorton]

Created #19578 to track improvements required to how-to topics.

[dedemorton]

Added js and CSS requirements to the tracking issue about the tabbed panel widgets: elastic/docs#260 (comment)

[dedemorton]

Closing because all the required PRs are in place (some can't be merged until 7.9 is GA).