Fix: nginx - add rule to disable url-rewriting for the docs

Related to #1603

.docker/nginx.conf

@@ -29,7 +29,7 @@ http {
             log_not_found off;
             deny all;
         }
-        
+
         location ~ ~$ {
             # deny access to temp editor files, e.g. "script.php~"
             access_log off;
@@ -65,6 +65,11 @@ http {
             include        fastcgi.conf;
         }
 
+        location ~ /doc/ {
+            default_type "text/html";
+            try_files $uri $uri/ $uri.html =404;
+        }
+
         location ~ \.php$ {
             # deny access to all other PHP scripts
             deny all;

doc/md/Server-configuration.md

@@ -325,6 +325,11 @@ server {
         deny all;
     }
 
+    location ~ /doc/ {
+        default_type "text/html";
+        try_files $uri $uri/ $uri.html =404;
+    }
+
     location = /favicon.ico {
         # serve the Shaarli favicon from its custom location
         alias /var/www/shaarli/images/favicon.ico;