Stop using bower

`bower` is maintained but not recommended for use by its developers. Our
`bower.json` file now only includes two dependencies: `jquery` and
`jquery-flot`. At this point, `bower` is not doing much to serve the
project.

This patch makes the following primary changes:

- Remove files related to `bower`
- Put the minified source files for `jquery` and `jquery-flot` directly
  in `static/js/lib/`
- Remove the project directories for `jquery` and `jquery-flot`.

The following smaller changes are also included:

- Remove `Makefile` rules related to `bower` and `jquery-flot`
- Update the "JavaScript libraries" section of the `README.rst`

Author: adamzap

Diff for: Makefile

@@ -1,7 +1,6 @@
 .PHONY: all ci clean collectstatics compile-scss compile-scss-debug install run test watch-scss
 
 APP_LIST ?= accounts aggregator blog contact dashboard djangoproject docs foundation fundraising legacy members releases svntogit tracdb
-JQUERY_FLOT=djangoproject/static/js/lib/jquery-flot
 SCSS = djangoproject/scss
 STATIC = djangoproject/static
 
@@ -27,13 +26,6 @@ isort:
 isort-check:
 	python -m isort --check $(APP_LIST)
 
-$(JQUERY_FLOT)/:
-	npm run bower install
-
-$(JQUERY_FLOT)/jquery.flot.min.js: $(JQUERY_FLOT)
-	cat $(JQUERY_FLOT)/jquery.flot.js $(JQUERY_FLOT)/jquery.flot.time.js > $(JQUERY_FLOT)/jquery.flot.concat.js
-	yuicompressor $(JQUERY_FLOT)/jquery.flot.concat.js -o $(JQUERY_FLOT)/jquery.flot.min.js
-
 migrations-check:
 	python -m manage makemigrations --check --dry-run
 

Diff for: README.rst

@@ -234,23 +234,9 @@ Check out the ``Procfile`` file for all the process names.
 JavaScript libraries
 --------------------
 
-This project uses `Bower <https://bower.io/>`_ to manage JavaScript libraries.
-
-At any time, you can run it to install a new library (e.g., ``jquery-ui``)::
-
-    npm run bower install jquery-ui --save
-
-or check if there are newer versions of the libraries that we use::
-
-    npm run bower ls
-
-If you need to update an existing library, the easiest way is to change the
-version requirement in ``bower.json`` and then to run
-``npm run bower install`` again.
-
-We commit the libraries to the repository, so if you add, update, or remove a
-library from ``bower.json``, you will need to commit the changes in
-``djangoproject/static`` too.
+This project's JavaScript libraries can be found in
+``djangoproject/static/js/lib/``. If you need to add a library, commit the
+minified version of it to this directory.
 
 Documentation search
 --------------------