Add redirects for canonical route cleanup (#75) (#101)

Follows shakacode/react_on_rails#3067, which canonicalized four
verbose docs URL slugs via Docusaurus `slug:` frontmatter.

- Redirect the four legacy URLs (with and without trailing slash) to
  their new canonical destinations
- Point the existing `/docs/guides/file-system-based-automated-bundle-generation.md`
  redirect directly at `/docs/core-concepts/auto-bundling/` to avoid a
  redirect chain
- Update site-shell links (footer and `docsRoutes` constants) that
  still referenced the legacy `installation-into-an-existing-rails-app`
  slug

Fixes #75

Author: justin808

prototypes/docusaurus/docusaurus.config.ts

@@ -143,7 +143,7 @@ const config: Config = {
             {label: 'Create a New App', to: '/docs/getting-started/create-react-on-rails-app'},
             {
               label: 'Install into Existing Rails App',
-              to: '/docs/getting-started/installation-into-an-existing-rails-app',
+              to: '/docs/getting-started/existing-rails-app',
             },
             {label: 'Quick Start', to: '/docs/getting-started/quick-start'},
             {label: 'Compare OSS and Pro', to: '/docs/getting-started/oss-vs-pro'},

prototypes/docusaurus/src/constants/docsRoutes.ts

@@ -1,7 +1,7 @@
 export const docsRoutes = {
   docsGuide: '/docs/',
   createApp: '/docs/getting-started/create-react-on-rails-app',
-  installExistingApp: '/docs/getting-started/installation-into-an-existing-rails-app',
+  installExistingApp: '/docs/getting-started/existing-rails-app',
   ossVsPro: '/docs/getting-started/oss-vs-pro',
   proOverview: '/docs/pro',
   proUpgrade: '/docs/pro/upgrading-to-pro',

prototypes/docusaurus/static/_redirects

@@ -1,4 +1,4 @@
-/docs/guides/file-system-based-automated-bundle-generation.md /docs/core-concepts/auto-bundling-file-system-based-automated-bundle-generation/ 301
+/docs/guides/file-system-based-automated-bundle-generation.md /docs/core-concepts/auto-bundling/ 301
 /docs/guides/configuration /docs/configuration/ 301
 /docs/guides/configuration/ /docs/configuration/ 301
 /docs/guides/upgrading-react-on-rails /docs/upgrading/upgrading-react-on-rails/ 301
@@ -23,3 +23,13 @@
 /react-on-rails/docs /docs 301
 /react-on-rails-pro/docs/* /docs/:splat 301
 /react-on-rails-pro/docs /docs 301
+
+# Canonical route cleanup from react_on_rails (see shakacode/react_on_rails#3067)
+/docs/core-concepts/auto-bundling-file-system-based-automated-bundle-generation /docs/core-concepts/auto-bundling/ 301
+/docs/core-concepts/auto-bundling-file-system-based-automated-bundle-generation/ /docs/core-concepts/auto-bundling/ 301
+/docs/getting-started/installation-into-an-existing-rails-app /docs/getting-started/existing-rails-app/ 301
+/docs/getting-started/installation-into-an-existing-rails-app/ /docs/getting-started/existing-rails-app/ 301
+/docs/building-features/how-to-conditionally-server-render-based-on-device-type /docs/building-features/conditional-server-rendering/ 301
+/docs/building-features/how-to-conditionally-server-render-based-on-device-type/ /docs/building-features/conditional-server-rendering/ 301
+/docs/building-features/how-to-use-different-files-for-client-and-server-rendering /docs/building-features/client-server-files/ 301
+/docs/building-features/how-to-use-different-files-for-client-and-server-rendering/ /docs/building-features/client-server-files/ 301