Fix eslint warnings

Since we are about to release it's time to finally fix our linting. This
patch basically runs eslint --fix and does some further manual fixes.
Also it sets up eslint to fail on every warning on order to make
warnings visable in the CI process.

There should no functional change be introduced.

Signed-off-by: Sheogorath <sheogorath@shivering-isles.com>

public/js/pretty.js

@@ -1,29 +1,29 @@
 /* eslint-env browser, jquery */
 /* global refreshView */
 
+import {
+  autoLinkify,
+  deduplicatedHeaderId,
+  removeDOMEvents,
+  finishView,
+  generateToc,
+  md,
+  parseMeta,
+  postProcess,
+  renderTOC,
+  scrollToHash,
+  smoothHashScroll,
+  updateLastChange
+} from './extra'
+
+import { preventXSS } from './render'
+
 require('../css/extra.css')
 require('../css/slide-preview.css')
 require('../css/site.css')
 
 require('highlight.js/styles/github-gist.css')
 
-import {
-    autoLinkify,
-    deduplicatedHeaderId,
-    removeDOMEvents,
-    finishView,
-    generateToc,
-    md,
-    parseMeta,
-    postProcess,
-    renderTOC,
-    scrollToHash,
-    smoothHashScroll,
-    updateLastChange
-} from './extra'
-
-import { preventXSS } from './render'
-
 const markdown = $('#doc.markdown-body')
 const text = markdown.text()
 const lastMeta = md.meta
@@ -38,7 +38,7 @@ if (md.meta.type && md.meta.type === 'slide') {
   const slides = window.RevealMarkdown.slidify(text, slideOptions)
   markdown.html(slides)
   window.RevealMarkdown.initialize()
-    // prevent XSS
+  // prevent XSS
   markdown.html(preventXSS(markdown.html()))
   markdown.addClass('slides')
 } else {
@@ -46,12 +46,12 @@ if (md.meta.type && md.meta.type === 'slide') {
     refreshView()
     markdown.removeClass('slides')
   }
-    // only render again when meta changed
+  // only render again when meta changed
   if (JSON.stringify(md.meta) !== JSON.stringify(lastMeta)) {
     parseMeta(md, null, markdown, $('#ui-toc'), $('#ui-toc-affix'))
     rendered = md.render(text)
   }
-    // prevent XSS
+  // prevent XSS
   rendered = preventXSS(rendered)
   const result = postProcess(rendered)
   markdown.html(result.html())
@@ -98,14 +98,14 @@ function generateScrollspy () {
 }
 
 function windowResize () {
-    // toc right
+  // toc right
   const paddingRight = parseFloat(markdown.css('padding-right'))
   const right = ($(window).width() - (markdown.offset().left + markdown.outerWidth() - paddingRight))
   toc.css('right', `${right}px`)
-    // affix toc left
+  // affix toc left
   let newbool
   const rightMargin = (markdown.parent().outerWidth() - markdown.outerWidth()) / 2
-    // for ipad or wider device
+  // for ipad or wider device
   if (rightMargin >= 133) {
     newbool = true
     const affixLeftMargin = (tocAffix.outerWidth() - tocAffix.width()) / 2
@@ -126,7 +126,7 @@ $(document).ready(() => {
   windowResize()
   generateScrollspy()
   setTimeout(scrollToHash, 0)
-    // tooltip
+  // tooltip
   $('[data-toggle="tooltip"]').tooltip()
 })