Minor adjustments to visuals

- Removes unnecessary spaces;
- Clarifies sentences;
- Adds returns to declutter slides;
- Implements incremental slides to improve the flow of the presentation;
- Corrects content that overflows slides;
- Unifies information in certain slides;
- Corrects indentation;
- Merges slides towards the end of the presentation;
Adds translated terms in English for reference.

Author: pedrohbraga

pres-en/assets/header-attrs-2.20/header-attrs.js

@@ -0,0 +1,12 @@
+// Pandoc 2.9 adds attributes on both header and div. We remove the former (to
+// be compatible with the behavior of Pandoc < 2.8).
+document.addEventListener('DOMContentLoaded', function(e) {
+  var hs = document.querySelectorAll("div.section[class*='level'] > :first-child");
+  var i, h, a;
+  for (i = 0; i < hs.length; i++) {
+    h = hs[i];
+    if (!/^h[1-6]$/i.test(h.tagName)) continue;  // it should be a header h1-h6
+    a = h.attributes;
+    while (a.length > 0) h.removeAttribute(a[0].name);
+  }
+});