release-12.10.2021-13.10

🚀 What's new?

@paperclypse - Started reorganizing the Welcome to New Relic content ->
@paperclypse - Finished reorganizing the docs in the "get started" section ->
@paperclypse - style(Docs): Moved files and added redirects ->
@paperclypse - style(Docs): Finished adding redirects and moving troubleshooting docs ->
@paperclypse - Merge branch 'develop' into doc-7562-welcome-docs ->
@paperclypse - style(Docs): Finished moving content around, modifying the Welcome to New Relic category ->
@paperclypse - Merge branch 'doc-7562-welcome-docs' of https://github.com/newrelic/docs-website into doc-7562-welcome-docs ->
@paperclypse - fix(Docs): Removed some trailing slashes ->
@paperclypse - fix(Docs): I had a hyphen with no path in a redirect section ->
@paperclypse - style(Docs): Renamed Networks doc back to "Networks" ->
@paperclypse - Merge pull request #5200 from newrelic/doc-7562-welcome-docs ->