[TASK] Streamline and improve styling of forms

This is a first step towards the completion of #53
* removes <ol> <ul> enumerations
* puts inputs always below label (not inline)
* increases the width of all input fields
* styles input fields with autocomplete differently so that they can be recognized as such
* changes reporter field to be a textarea
* changes link description to be a textarea
* adds icons to add and remove buttons
* increases default height of markdown editor slightly
* makes markdown editor vertically resizable