Reworked the login page
- Simplified some of the HTML and CSS
- Removed some `aria-label`s
- Added alt text for the logo
- Added a label for the input field
- Added subtle borders to otherwise flat elements

Reviewed-on: https://codeberg.org/superseriousbusiness/masto-fe-standalone/pulls/76
Co-authored-by: Zoë Bijl <code@moiety.me>
Co-committed-by: Zoë Bijl <code@moiety.me>
* Add eslint to dev dependancies so it gets installed for the repo
yarn add --dev eslint babel-eslint eslint-plugin-reac
project specific version of eslint, you can globally install eslint-cli
if you want the global runtime, or add .bin to your path
* fix eslint errors about inconsitent returns
* eslint ignore the same as git ignore. allows for eslint .
* Add editorconfig file so everyones editor will be setup to follow the same standards