Vendor dependencies for 0.3.0 release

vendor/bevy/docs-template/features.md.tpl

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+<!-- MD041 - This file will be included in docs and should not start with a top header -->
+<!-- markdownlint-disable-file MD041 -->
+
+## Cargo Features
+
+Bevy exposes many features to customize the engine. Enabling them add functionalities but often come at the cost of longer compilation times and extra dependencies.
+
+### Default Features
+
+The default feature set enables most of the expected features of a game engine, like rendering in both 2D and 3D, asset loading, audio and UI. To help reduce compilation time, consider disabling default features and enabling only those you need.
+
+|feature name|description|
+|-|-|
+{% for feature in features %}{% if feature.is_default %}|{{ feature.name }}|{{ feature.description }}|
+{% endif %}{% endfor %}
+### Optional Features
+
+|feature name|description|
+|-|-|
+{% for feature in features %}{% if feature.is_default == False %}|{{ feature.name }}|{{ feature.description }}|
+{% endif %}{% endfor %}