Update index.rst

Author: danamlewis

docs/docs/Resources/index.rst

@@ -14,3 +14,6 @@ Resources
    faq
    glossary
    switching-between-DIY-systems
+   Manual Edison Flashing instructions - all computer types </Edison-Flashing/all-computers-flash>
+   Manual Edison Flashing instructions - FOR MAC </Edison-Flashing/mac-flash>
+   Manual Edison Flashing instructions - FOR WINDOWS </Edison-Flashing/pc-flash>