Examples should not use deprecated Swig package

[fohlin]

README.md has some nice introductory examples using Swing templates. However, paularmstrong/swig is unsupported and marked deprecated on npm. The corresponding docs link gives a 404.

I recommend switching to another template language for the examples here.

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I have investigated using the community-supported node-swig/swig-templates which does work but with a poor experience in its current state. It's poor mainly because the docs are not updated and still reference the deprecated package (see node-swig/swig-templates#32). For reference, this works fine:

const swig = require('swig-templates');
const consolidate = require('@frctl/consolidate');

const swigAdapter = consolidate('swig', swig)
fractal.components.engine(swigAdapter);
fractal.components.set('ext', '.swig');