Add ONLYOFFICE offline download

Will close #160

yaml/degoogle.yml

@@ -334,6 +334,11 @@ web based products:
       eyes: null
       text: |
         It's an open-source (and offline) document processor using TeX/LaTeX. It's different than Docs or Word but amazing, once you get used to it. Thanks @Glitchy-Tozier
+    - name: ONLYOFFICE
+      url: https://www.onlyoffice.com/download-desktop.aspx
+      eyes: null
+      text: |
+        Offline version of ONLYOFFICE, an open-source private cloud replacement for Google Docs'suite and Office 360. Also available as a self contained rich application. Thanks @PalmoliveDev
   domains:
     - title: Domains
     - name: Njalla