Fixes broken images for the checkboxes (#221)

# AtlasKit
- Label as concept is separately proposed for the AtlasKit so I just copy from default
- Without label probably supported by AtlasKit given that label property can be set and in the documentation there no clear specification on required/not-required status of the field. If somebody from Atlassian can join and tell exact state, then it can be documented for `withoutLabel` concept
- Removed just HTML attributes like id, name, value. My understanding they are not of value for this project.

# Evergreen
- Removed just HTML attributes like id, name, value. My understanding they are not of value for this project.
- Removed `invalid`, since for them this is only ARIA related change. Since no visibility for UI, then it's not clear how to capture that in current documentation
- Removed `appearance` and `theme` since this is abstrations which are not part of this project IMO.

research/src/sources/atlassian.json5

@@ -87,10 +87,6 @@
           "description": "",
           "image": "atlaskit-checkbox-basic.png"
         },
-        {
-          "name": "id",
-          "description": "id assigned to input"
-        },
         {
           "name": "checked",
           "description": "Sets whether the checkbox is checked or unchecked.",
@@ -118,19 +114,13 @@
         },
         {
           "name": "required",
-          "description": "Marks the field as required & changes the label style."
+          "description": "Marks the field as required & changes the label style.",
+          "image": "atlaskit-checkbox-required.png"
         },
         {
           "name": "label",
-          "description": "The label to be displayed to the right of the checkbox. The label is part of the clickable element to select the checkbox."
-        },
-        {
-          "name": "name",
-          "description": "The name of the submitted field in a checkbox."
-        },
-        {
-          "name": "value",
-          "description": "The value to be used in the checkbox input. This is the value that will be returned on form submission."
+          "description": "The label to be displayed to the right of the checkbox. The label is part of the clickable element to select the checkbox.",
+          "image": "atlaskit-checkbox-basic.png"
         }
       ]
     },

research/src/sources/evergreen.json5

@@ -164,23 +164,11 @@
           "description": "Basic checkbox",
           "image": "evergreen-checkbox-basic.png"
         },
-        {
-          "name": "id",
-          "description": "The id attribute of the checkbox."
-        },
-        {
-          "name": "name",
-          "description": "The id attribute of the checkbox."
-        },
         {
           "name": "label",
           "description": "Label of the checkbox.",
           "image": "evergreen-checkbox-label.png"
         },
-        {
-          "name": "value",
-          "description": "The value attribute of the checkbox."
-        },
         {
           "name": "checked",
           "description": "The checked attribute of the checkbox.",
@@ -195,18 +183,6 @@
           "name": "disabled",
           "description": "When true, the checkbox is disabled.",
           "image": "evergreen-checkbox-disabled.png"
-        },
-        {
-          "name": "invalid",
-          "description": "When true, the aria-invalid attribute is true. Used for accessibility."
-        },
-        {
-          "name": "appearance",
-          "description": "The appearance of the checkbox. The default theme only comes with a default style."
-        },
-        {
-          "name": "theme",
-          "description": "Theme provided by ThemeProvider."
         }
       ]
     },