Move as many config files as possible to /conf

Our root directory is getting a little noisy; let's try to move as many of config files as possible to `/conf`. A lot of the tools that use them offer options for custom locations for the config files. A lot of the new ones are npm related, so let's create a `/conf/npm` directory for all of those.

Here are all the config files currently in the root directory:

File | Can Move? | Moved?
-- | -- | --
.babelrc | ??? | -
.browserslistrc | ??? | -
.dockerignore | ??? | -
.eslintignore | ??? | -
.eslintrc.json | ??? | -
.gitattributes | Let's not move git stuff | -
.gitignore | Let's not move git stuff | -
.gitmodules | Let's not move git stuff | -
.python-version | ??? | -
.stylelintignore | ??? | -
.stylelintrc.json | ??? | -
.svgo.yml | ✅ | -
.travis.yml | ??? | -
docker-compose.yml | Let's not move docker either | -
package-lock.json | Let's leave requirements here | -
package.json | Let's leave requirements here | -
webpack.config.js | ??? | -