[feat] engines: add luxxle (general, news, images, videos)

Add support for https://luxxle.com

Localization is not yet supported because it doesn't seem to work on their
website either, no matter which language I select, it only returns English web
results

searx/settings.yml

@@ -1477,6 +1477,38 @@ engines:
     shortcut: luc
     timeout: 3.0
 
+  - name: luxxle
+    engine: luxxle
+    categories: general
+    luxxle_categ: search
+    shortcut: lux
+    disabled: true
+    inactive: true
+
+  - name: luxxle images
+    engine: luxxle
+    categories: images
+    luxxle_categ: images
+    shortcut: luxi
+    disabled: true
+    inactive: true
+
+  - name: luxxle videos
+    engine: luxxle
+    categories: videos
+    luxxle_categ: videos
+    shortcut: luxv
+    disabled: true
+    inactive: true
+
+  - name: luxxle news
+    engine: luxxle
+    categories: news
+    luxxle_categ: news
+    shortcut: luxn
+    disabled: true
+    inactive: true
+
   - name: marginalia
     engine: marginalia
     shortcut: mar