Doc: Update README.md API_LEVEL section

Remove release candidates OS from API_LEVEL table.

README.md

@@ -55,34 +55,23 @@ In short, to build an app for an OS, you should:
 
 ## About API_LEVEL branches
 
-This list the API_LEVEL branches with their purposed (corresponding OS) and state if they should still be patched or not (OS not “active” anymore).
-OS release candidates are only kept in the list when a corresponding OS release production might be released on the same API_LEVEL.
-
-| Name | Related OS | Active
-|---------|-------------------------------------------------------------------------------------------------------------------------------|-------------------
-| LNS | <br/> nanos_2.1.0 | :heavy_check_mark:
-| 1 | nanox_2.1.0 <br/> nanos+_1.1.0 | :x:
-| 2 | only rc releases | :x:
-| 3 | only rc releases | :x:
-| 4 | only rc releases | :x:
-| 5 | nanox_2.2.{0, 1, 2, 3} <br/> nanos+ 1.1.1 | :heavy_check_mark:
-| 6 | only rc releases | :x:
-| 7 / 7.1 | only rc releases | :x:
-| 7.2 | only rc releases<br/> (not compatible due <br/> to font update) | :x:
-| 8 | stax_1.0.0 | :x:
-| 9 | only rc releases | :x:
-| 10 | stax_1.1.0 | :x:
-| 11 | stax_1.2.0 <br/> stax_1.2.1 | :x:
-| 12 | nanox_2.3.0-rc2 <br/> nanos+_1.2.0-rc2 | :x:
-| 13 | stax_1.3.0 | :x:
-| 14 | only rc releases | :x:
-| 15 | stax_1.4.0 | :heavy_check_mark:
-| 16 | europa_0.1.0-re1 | :x:
-| 17 | europa_0.1.0-re2 | :x:
-| 18 | europa_0.1.0-re3 <br/> flex_0.2.0-rc1 <br /> flex_0.2.0-rc2 <br /> nanox_2.3.0-rc5 <br/> nanos+_1.2.0-rc5 <br/> nanos+_1.2.0 | :heavy_check_mark:
-| 19 | flex_1.0.0-rc1 <br/> flex_1.0.0-rc2 <br/> flex_1.0.0 <br/> flex_1.0.1 <br/> | :x:
-| 20 | stax_1.5.0-rc1 <br/> flex_1.1.0-rc1 | :x:
-| 21 | stax_1.5.0-rc2 <br/> flex_1.1.0-rc2 <br/> stax_1.5.0 <br/> flex_1.1.0 <br/> flex_1.1.1 <br/> | :heavy_check_mark:
+This list the main API_LEVEL branches with their purposed (corresponding OS) and state if they should still be patched or not (OS not “active” anymore).
+
+The full mapping of API_LEVEL branches, including OS release candidates, is available [here](api_levels.json).
+
+| Name | Related OS | Active |
+| ---- | -------------------------------------------------- | ------------------ |
+| LNS | <br/> nanos_2.1.0 | :heavy_check_mark: |
+| 1 | nanox_2.1.0 <br/> nanos+_1.1.0 | :x: |
+| 5 | nanox_2.2.{0, 1, 2, 3} <br/> nanos+ 1.1.1 | :heavy_check_mark: |
+| 8 | stax_1.0.0 | :x: |
+| 10 | stax_1.1.0 | :x: |
+| 11 | stax_1.2.0 <br/> stax_1.2.1 | :x: |
+| 13 | stax_1.3.0 | :x: |
+| 15 | stax_1.4.0 | :x: |
+| 18 | nanos+_1.2.0 | :heavy_check_mark: |
+| 19 | flex_1.0.0 <br/> flex_1.0.1 <br/> | :x: |
+| 21 | stax_1.5.0 <br/> flex_1.1.0 <br/> flex_1.1.1 <br/> | :heavy_check_mark: |
 
 ### Cherry-picking process: