Embedding the Github Contribution Calendar

github-graph.js

var proxy = 'https://urlreq.appspot.com/req?method=GET&url=',
  url = proxy + 'https://github.com/{{ site.github }}',
  colors = {
    'eeeeee': 'github-graph-none',
    'd6e685': 'github-graph-litte',
    '8cc665': 'github-graph-some',
    '44a340': 'github-graph-more',
    '1e6823': 'github-graph-most'
  };

document.addEventListener('DOMContentLoaded', function () {

  fetch(url)
    .then(function responseThen (response) {
      return response.text();
    })
    .then(function fetchThen (body) {
      var wrapper = document.createElement('div'),
        container = document.querySelector('#github-graph'),
        graph,
        gs,
        fill,
        index;

      wrapper.innerHTML = body;

      graph = wrapper.querySelector('svg.js-calendar-graph-svg');
      gs = [].slice.call(graph.querySelectorAll('g g'));

      for (var g of gs) {
        index = gs.indexOf(g);

        if (index < 26) {
          g.parentElement.removeChild(g);
        }
        else {
          g.attributes.transform.value = 'translate(' + (13 * (index - 26)) + ', 0)';
        }
      }

      for(var rect of graph.querySelectorAll('rect')) {
        fill = rect.getAttribute('fill').substring(1);

        if (colors[fill]) {
          rect.classList.add(colors[fill]);
        }
      }

      graph.setAttribute('version', '1.1');
      graph.setAttribute('xmlns', 'http://www.w3.org/2000/svg');
      graph.setAttribute('xmlns:xlink', 'http://www.w3.org/1999/xlink');
      graph.setAttribute('xml:space', 'preserve');

      container.innerHTML = graph.outerHTML;
    });

});

Hello, I'm a novice on programming. Doing my small project with my team mates, I got a responsible for getting gitlab commit graph on our page. Although I had searched so many methods for doing this, I couldn't find a suitable way. The only way for solving this problem would be disassembling all of the data, and reassemble in a graph but I cannot afford to do it.
So, I wonder how can I apply this to other pages. If you are willing to let me learn how to use this, please reply me whenever you're available.

Have a look at this link for more details: https://shellscape.org/2016/08/31/embedding-github-contribution-calendar