Remove maya sequencer adapter related files (#1520)

* Remove maya adapter related files
* Update docs

Signed-off-by: rosborne132 <[email protected]>

Author: rosborne132

.codecov.yml

@@ -19,7 +19,6 @@ comment:
 
 ignore:
   - "contrib/opentimelineio_contrib/adapters/tests/test_rvsession.py"
-  - "contrib/opentimelineio_contrib/adapters/tests/test_maya_sequencer.py"
   - "contrib/opentimelineio_contrib/adapters/tests/test_burnins.py"
   - "contrib/opentimelineio_contrib/adapters/burnins.py"
   - "*aaf2*"

contrib/opentimelineio_contrib/adapters/contrib_adapters.plugin_manifest.json

@@ -13,12 +13,6 @@
             "filepath": "hls_playlist.py",
             "suffixes": ["m3u8"]
         },
-        {
-            "OTIO_SCHEMA" : "Adapter.1",
-            "name" : "maya_sequencer",
-            "filepath" : "maya_sequencer.py",
-            "suffixes" : ["ma","mb"]
-        },
         {
             "OTIO_SCHEMA" : "Adapter.1",
             "name" : "ale",