Updated compose modal

Added "publish" button on top of modal. Added compose modal scroll functionality. Updated max height for textbox. Removed avatar, arrow on compose modal for more room. Updated image upload sizes for composer.
Fixes: #83

app/javascript/gabsocial/features/compose/components/upload.js

@@ -10,6 +10,7 @@ import Icon from 'gabsocial/components/icon';
 
 const messages = defineMessages({
   description: { id: 'upload_form.description', defaultMessage: 'Describe for the visually impaired' },
+  delete: { id: 'upload_form.undo', defaultMessage: 'Delete' },
 });
 
 export default @injectIntl
@@ -100,7 +101,7 @@ class Upload extends ImmutablePureComponent {
           {({ scale }) => (
             <div className='compose-form__upload-thumbnail' style={{ transform: `scale(${scale})`, backgroundImage: `url(${media.get('preview_url')})`, backgroundPosition: `${x}% ${y}%` }}>
               <div className={classNames('compose-form__upload__actions', { active })}>
-                <button className='icon-button' onClick={this.handleUndoClick}><Icon id='times' /> <FormattedMessage id='upload_form.undo' defaultMessage='Delete' /></button>
+                <button className='icon-button' title={intl.formatMessage(messages.delete)} onClick={this.handleUndoClick}><Icon id='times'/></button>
                 {media.get('type') === 'image' && <button className='icon-button' onClick={this.handleFocalPointClick}><Icon id='crosshairs' /> <FormattedMessage id='upload_form.focus' defaultMessage='Crop' /></button>}
               </div>