Merge pull request #64 from DHTMLX/next

[dev] add redirect links

Author: mafanya23

docker/redirects.conf

@@ -1,6 +1,8 @@
 /installation.html	/spreadsheet/initialization.html;
 /api__selection__getselectedcells.html /spreadsheet/api__selection__getselectedcell.html;
 /api__selection__setselectedcells.html /spreadsheet/api__selection__setselectedcell.html;
+/deprecated_doc.html	/spreadsheet/migration/#21---30/;
+/react_integration.html	/spreadsheet/react/;
 
 /angular_integration.html	/spreadsheet/angular_integration/;
 /react_integration.html	/spreadsheet/react_integration/;