Add Backstage logo (#7949)

* Add backstage icon

* Ignore idea meta files

* Change base icon

* Lint fix

* Update image

* Change imagem

* Fix CSV

* Remove personal gitignore configuration

* Fix the base color of Backstage

* Update svg to keep the best pattern

* Change backstage color base

Co-authored-by: Engin Diri <engin.diri@mail.schwarz>

_data/simple-icons.json

@@ -1311,6 +1311,11 @@
             "hex": "FFFFFF",
             "source": "https://backendless.com/"
         },
+        {
+            "title": "Backstage",
+            "hex": "9BF0E1",
+            "source": "https://backstage.io/"
+        },
         {
             "title": "Badgr",
             "hex": "282C4C",

icons/backstage.svg

@@ -0,0 +1 @@
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