dev: add website aliases

[ldez]

I discovered that we can create path aliases to match the previous paths to the documentation.

mapping

OLD	NEW
/welcome/install/	/docs/welcome/install/
/welcome/quick-start/	/docs/welcome/quick-start/
/welcome/integrations/	/docs/welcome/integrations/
/welcome/faq/	/docs/welcome/faq/
/usage/configuration/	/docs/configuration/
/usage/linters/	/docs/linters/
/usage/false-positives/	/docs/linters/false-positives/
/usage/formatters/	/docs/formatters/
/product/thanks/	/docs/product/thanks/
/product/changelog/	/docs/product/changelog/
/product/migration-guide/	/docs/product/migration-guide/
/product/roadmap/	/docs/product/roadmap/
/contributing/quick-start/	/docs/contributing/
/contributing/workflow/	/docs/contributing/workflow/
/contributing/architecture/	/docs/contributing/architecture/
/contributing/new-linters/	/docs/contributing/new-linters/
/contributing/debug/	/docs/contributing/debug/
/contributing/faq/	/docs/contributing/faq/
/contributing/website/	/docs/contributing/website/
/plugins/module-plugins/	/docs/plugins/module-plugins/
/plugins/go-plugins/	/docs/plugins/go-plugins/

Follows #5965

[alexandear]

I propose adding an alias to docs/content/docs/contributing/_index.md:

aliases:
  - /contributing/quick-start/