Add ability to customize font size

Added an ability to customize font sizes. This is set at a new section in the settings.
The controler for this sets a number of css variables which are used in css rules that
override tailwind's text-<size> to use the font size and line spacing contained in the
variable. The control itself is a simple logarithmic slider that controls a "scale
factor" by which all the text sizes in a resume are scaled by.

src/templates/blocks/Projects/ProjectsA.js

@@ -10,7 +10,7 @@ const ProjectItem = ({ item, language }) => {
     <div>
       <div className="flex justify-between items-center">
         <div className="flex flex-col text-left mr-2">
-          <h6 className="font-semibold">{item.title}</h6>
+          <h6 className="font-semibold text-sm">{item.title}</h6>
           {item.link && (
             <a href={item.link} className="text-xs">
               {item.link}