fix(nginx): preserve docs routes and asset 404s

nginx/nginx.conf

@@ -25,6 +25,7 @@ http {
         listen 80;
         server_name _;
         absolute_redirect off;
+        root /usr/share/nginx/html;
 
         # # Static files handling
         # location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
@@ -34,18 +35,42 @@ http {
 
         include /etc/nginx/conf.d/redirects.conf;
 
+        # Keep missing static assets as real 404s instead of redirecting them to the docs home.
+        # The generated app emits page files at the web root while public assets are served under /docs.
+        location ~* ^/docs/(.+\.(?:avif|css|gif|ico|jpe?g|js|json|map|png|svg|ttf|txt|webmanifest|webp|woff2?|xml))$ {
+            try_files $uri /$1 =404;
+        }
+
+        location ~* \.(?:avif|css|gif|ico|jpe?g|js|json|map|png|svg|ttf|txt|webmanifest|webp|woff2?|xml)$ {
+            try_files $uri =404;
+        }
+
+        location = /docs {
+            try_files /docs/index.html /index.html @docs_soft_404;
+        }
+
+        location = /docs/ {
+            try_files /docs/index.html /index.html @docs_soft_404;
+        }
+
+        location ~ ^/docs/(.+)$ {
+            index index.html;
+            try_files $uri/index.html $uri.html $uri /$1/index.html /$1.html /$1 @docs_soft_404;
+        }
+
         location / {
-            root /usr/share/nginx/html;
             index index.html;
             # # Add rewrite rule to handle URLs without trailing slash
             # rewrite ^([^.]*[^/])$ $1/ permanent;
-            try_files $uri/index.html $uri.html $uri =404;
+            try_files $uri/index.html $uri.html $uri @docs_soft_404;
+        }
+
+        location @docs_soft_404 {
+            return 302 /docs;
         }
-        # non existent pages are redirected to 404.html
-        error_page 404 /404.html;
 
         # a folder without index.html raises 403 in this setup
-        error_page 403 /404.html;
+        error_page 403 =302 /docs;
         location = /favicon.ico {
             rewrite ^/favicon.ico$ /docs/brand/favicon.ico;
             access_log off;