add better role organization

src/config/dashboard.yaml

@@ -1,48 +1,19 @@
 officer:
   roles:
     - "IEEE Officer"
+
+executive:
+  include:
+    - "officer"
+  roles:
     - "IEEE Executive"
+
+administrator:
+  include:
+    - "executive"
+  roles:
     - "IEEE Administrator"
 
-supported_file_types:
+sponsor:
-  - "image"
+  roles:
-  - "video"
+    - "IEEE Sponsor"
-  - "audio"
-  - "pdf"
-  - "doc"
-  - "docx"
-  - "ppt"
-  - "pptx"
-  - "txt"
-  - "csv"
-  - "mp4"
-  - "mov"
-  - "avi"
-  - "mkv"
-  - "webm"
-  - "m4a"
-  - "mp3"
-  - "wav"
-  - "m4v"
-  - "m4b"
-  - "m4p"
-  - "m4v"
-  - "m4b"
-  - "png"
-  - "jpg"
-  - "jpeg"
-  - "gif"
-  - "bmp"
-  - "tiff"
-  - "ico"
-  - "webp"
-  - "heic"
-  - "heif"
-  - "hevc"
-  - "json"
-  - "md"
-  - "csv"
-  - "txt"
-  - "xml"
-  - "yaml"
-  - "yml"