Replace shortlink files with shortlink list (#416)

* add shortlink generator

* Add missing short link

* Remove old shortlink pages

* GitHub Copilot feedback: remove unused parameter

Author: keunes

_data/shortlinks.yml

@@ -0,0 +1,10 @@
+# Shortlinks configuration
+# Each entry creates a redirect from /s/{slug} to the target URL
+- slug: ads
+  target: /documentation/general/ads
+- slug: stops-playing
+  target: /documentation/bugs-first-aid/playback-stops
+- slug: sync-help
+  target: /documentation/general/synchronization
+- slug: subs-gone
+  target: /documentation/bugs-first-aid/database-error

_plugins/shortlinks_generator.rb

@@ -0,0 +1,44 @@
+module Jekyll
+  class ShortlinkPage < Page
+    def initialize(site, base, dir, target, lang = nil)
+      @site = site
+      @base = base
+      @dir = dir
+      @name = 'index.html'
+
+      self.process(@name)
+      self.read_yaml(File.join(base, '_layouts'), 'redirect.html')
+      self.data['layout'] = 'redirect'
+      self.data['sitemap'] = false
+      self.data['redirect_to'] = target
+      self.data['lang'] = lang if lang
+    end
+  end
+
+  class ShortlinksGenerator < Generator
+    safe true
+    priority :low
+
+    def generate(site)
+      return unless site.data['shortlinks']
+
+      # Get languages from config, default to ['en'] if not set
+      languages = site.config['languages'] || ['en']
+      
+      site.data['shortlinks'].each do |shortlink|
+        slug = shortlink['slug']
+        target = shortlink['target']
+        
+        languages.each do |lang|
+          if lang == 'en' || lang == site.config['defaultLang']
+            # English/default language: create at /s/{slug}/
+            site.pages << ShortlinkPage.new(site, site.source, "/s/#{slug}", target, lang)
+          else
+            # Other languages: create at /{lang}/s/{slug}/
+            site.pages << ShortlinkPage.new(site, site.source, "/#{lang}/s/#{slug}", target, lang)
+          end
+        end
+      end
+    end
+  end
+end