Retire semantic_form_for

Also a buttload of form cleanups...

app/views/tracks/_form.html.haml

@@ -1,20 +1,2 @@
-.container
-  .row
-    .col-md-12
-      .page-header
-        %h1
-          - if @track.new_record?
-            New
-          = @track.name
-          Track
-  .row
-    .col-md-12
-      = semantic_form_for(@track, url: (@track.new_record? ? conference_program_tracks_path(@conference.short_title) : conference_program_track_path(@conference.short_title, @track))) do |f|
-        = f.input :name
-        = f.input :short_name, hint: "A short and unique handle for the track, using only letters, numbers, underscores, and dashes. This will be used to identify the track in URLs etc. Example: 'my_awesome_track'", input_html: { required: 'required', pattern: '[a-zA-Z0-9_-]+', title: 'Only letters, numbers, underscores, and dashes.' }
-        = f.input :color, input_html: {size: 6, type: 'color'}, required: true
-        = f.input :start_date, as: :string, input_html: { id: 'registration-period-start-datepicker', start_date: @conference.start_date, end_date: @conference.end_date, readonly: 'readonly' }
-        = f.input :end_date, as: :string, input_html: { id: 'registration-period-end-datepicker', readonly: 'readonly' }
-        = f.input :description, input_html: {rows: 2, data: { provide: 'markdown' } }, required: true, hint: "This will be public #{markdown_hint}".html_safe
-        = f.input :relevance, input_html: {rows: 5, data: { provide: 'markdown' } }, required: true, hint: "Please explain here how this track relates to the conference, how you are related to its content and why we should accept it. #{markdown_hint}".html_safe
-        = f.action :submit, as: :button, button_html: { class: 'btn btn-primary' }
+= form_for(@track, url: (@track.new_record? ? conference_program_tracks_path(@conference.short_title) : conference_program_track_path(@conference.short_title, @track))) do |f|
+  = render partial: 'form_fields', locals: { f: f }