Moving to node_modules folder to make easier to upgrade

trying to move from Bootstrap 3 to Bootstrap 5

node_modules/videojs-contrib-ads/docs/developer/overview.md

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+# Architecture Overview
+
+videojs-contrib-ads is separated into files by module.
+
+## Modules
+
+### plugin.js
+
+The entry point of the application. Registers the plugin with video.js and initializes other feature modules.
+
+### ads.js
+
+Implements the [public API](../integrator/api.md).
+
+### adBreak.js
+
+Common code that is invoked when ad breaks start and end. Used by Preroll.js, Midroll.js, and Postroll.js.
+
+### cancelContentPlay.js
+
+Feature that prevents content playback while prerolls are handled. cancelContentPlay is used when video.js middleware is *not* available.
+
+### playMiddleware.js
+
+Feature that prevents content playback while prerolls are handled. playMiddleware is used when video.js middleware is available.
+
+### contentupdate
+
+Implements the `contentchanged` event.
+
+### plugin.scss
+
+Styles for the ad player.
+
+### redispatch.js
+
+Feature that makes the presense of ads transparent to event listeners.
+
+### snapshot.js
+
+Feature that captures the player state before ads and restores it after ads.
+
+### states.js
+
+Used to import modules from the `states` folder. This works around an issue with bundler where importing the files directly may not load them in the correct order.
+
+### states
+
+The states folder contains the various states that videojs-contrib-ads can be in.
+
+### states/abstract
+
+States in the `abstract` subfolder are subclassed by the main states in the `states` folder itself. They implement common functionality used by similar states.
+
+## What's Next
+
+Learn more about [states](states.md).