feat: enable docs/next (#503)

* feat: enable `docs/next`

* undo unrelated whitespace changes

Author: mdjermanovic

src/_data/sites/de.yml

@@ -19,6 +19,7 @@ hostname: de.eslint.org
 locals:
   docs_latest: false
   docs_head: false
+  docs_next: false
   blog: false
 
 #------------------------------------------------------------------------------

src/_data/sites/en.yml

@@ -19,6 +19,7 @@ hostname: eslint.org
 locals:
   docs_latest: latest--docs-eslint.netlify.app
   docs_head: docs-eslint.netlify.app
+  docs_next: next--docs-eslint.netlify.app
   blog: true
 redirects:
   - from: https://cn.eslint.org/*

src/_data/sites/es.yml

@@ -19,6 +19,7 @@ hostname: es.eslint.org
 locals:
   docs_latest: false
   docs_head: false
+  docs_next: false
   blog: false
 
 #------------------------------------------------------------------------------

src/_data/sites/fr.yml

@@ -19,6 +19,7 @@ hostname: fr.eslint.org
 locals:
   docs_latest: false
   docs_head: false
+  docs_next: false
   blog: false
 
 #------------------------------------------------------------------------------

src/_data/sites/hi.yml

@@ -19,6 +19,7 @@ hostname: hi.eslint.org
 locals:
   docs_latest: false
   docs_head: false
+  docs_next: false
   blog: false
 
 #------------------------------------------------------------------------------

src/_data/sites/ja.yml

@@ -19,6 +19,7 @@ hostname: ja.eslint.org
 locals:
   docs_latest: false
   docs_head: false
+  docs_next: false
   blog: false
 
 #------------------------------------------------------------------------------

src/_data/sites/pt-br.yml

@@ -19,6 +19,7 @@ hostname: pt-br.eslint.org
 locals:
   docs_latest: false
   docs_head: false
+  docs_next: false
   blog: false
 
 #------------------------------------------------------------------------------

src/_data/sites/zh-hans.yml

@@ -19,6 +19,7 @@ hostname: zh-hans.eslint.org
 locals:
   docs_latest: zh-hans-docs.netlify.app
   docs_head: false
+  docs_next: false
   blog: false
 
 #------------------------------------------------------------------------------

src/static/redirects.njk

@@ -97,6 +97,13 @@ eleventyExcludeFromCollections: true
 /docs/head/*                        https://eslint.org/docs/head/:splat 302!
 {% endif %}
 
+# Docs for the current prerelease
+{% if site.locals.docs_next %}
+/docs/next/*                        https://{{ site.locals.docs_next }}/:splat 200!
+{% else %}
+/docs/next/*                        https://eslint.org/docs/next/:splat 302!
+{% endif %}
+
 {% if site.locals.blog == false %}
 # Redirect blog back to English site
 /blog/*                             https://eslint.org/blog/:splat 302!