feat: add Xing to Page Sharer (#1239)

data/page_sharer.toml

@@ -64,3 +64,11 @@
   icon_pack = "fab"
   icon = "pinterest"
   enable = false
+
+[[buttons]]
+  id = "xing"
+  url = "https://www.xing.com/spi/shares/new?url={url}&title={title}"
+  title = "Xing"
+  icon_pack = "fab"
+  icon = "xing"
+  enable = false