ESLint warnings

[lorensr]

cd docs && npm start results in:

warning ESLintError: 
/Users/me/gh/apollo/docs/source/components/workout-menu-item.js
  39:12  warning  Anchors must have content and the content must be accessible by a screen reader                 jsx-a11y/anchor-has-content
  39:12  warning  Visible, non-interactive elements with click handlers must have at least one keyboard listener  jsx-a11y/click-events-have-key-events
  39:12  warning  Static HTML elements with event handlers require a role                                         jsx-a11y/no-static-element-interactions

✖ 3 problems (0 errors, 3 warnings)