Remove bower instructions

Takes up a ton of README space for a defunct package manager. Can move to like bower.md or something alternatively

Author: austinpray-mixpanel

README.md

@@ -35,39 +35,6 @@ To load the core SDK and optionally load session recording bundle asynchronously
 import mixpanel from 'mixpanel-browser/src/loaders/loader-module-with-async-recorder';
 ```
 
-## Alternative installation via Bower
-`mixpanel-js` is also available via front-end package manager [Bower](http://bower.io/). After installing Bower, fetch into your project's `bower_components` dir with:
-```sh
-bower install mixpanel
-```
-
-### Using Bower to load the snippet
-You can then load the lib via the embed code (snippet) with a script reference:
-```html
-<script src="bower_components/mixpanel/mixpanel-jslib-snippet.min.js"></script>
-```
-which loads the _latest_ library version from the Mixpanel CDN ([http://cdn.mxpnl.com/libs/mixpanel-2-latest.min.js](http://cdn.mxpnl.com/libs/mixpanel-2-latest.min.js)).
-
-### Using Bower to load the entire library
-If you wish to load the specific version downloaded in your Bower package, there are two options.
-
-1) Override the CDN library location with the global `MIXPANEL_CUSTOM_LIB_URL` var:
-```html
-<script>
-  window.MIXPANEL_CUSTOM_LIB_URL = 'bower_components/mixpanel/mixpanel.js';
-</script>
-<script src="bower_components/mixpanel/mixpanel-jslib-snippet.min.js"></script>
-```
-or
-
-2) Recompile the snippet with a custom `MIXPANEL_LIB_URL` using [Closure Compiler](https://developers.google.com/closure/compiler/):
-```sh
-java -jar compiler.jar --js src/loaders/mixpanel-jslib-snippet.js --js_output_file mixpanel-jslib-snippet.min.js --compilation_level ADVANCED_OPTIMIZATIONS --define='MIXPANEL_LIB_URL="bower_components/mixpanel/mixpanel.js"'
-```
-
-### Upgrading from mixpanel-bower v2.2.0 or v2.0.0
-If you originally installed Mixpanel via Bower at its previous home ([https://github.com/drubin/mixpanel-bower](https://github.com/drubin/mixpanel-bower)), the two old versions have remained functionally unchanged. To upgrade to v2.3.6 or later (the first Bower version in the official repo) from a previous Bower install, note the changed filenames: previous references to `mixpanel.js` should become `mixpanel-jslib-snippet.min.js` (the minified embed code), and previous references to `mixpanel.dev.js` should become `mixpanel.js` (the library source) or `mixpanel.min.js` (the minified library for production use).
-
 ## Building bundles for release
 - Install development dependencies: `npm install`
 - Build: `npm run build-dist`