updated readme, cleaning out demo folder

Author: bbelderbos

days/025-028-javascript/README.md

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+# Building your first Javascript app
+
+In the coming 4 days you are going to write some 'Vanilla' (pure / no frameworks) Javascript.
+
+## Day 1
+
+Watch the first 9 videos about the history of JS, how to run it and some fundamental building blocks of the language.
+
+## Day 2
+
+Check out video 10 and practice what you've learned doing 1-4 optional exercises using _control flow_, _functions_, _looping_ and _objects_. 
+
+Check them out [here](demo/language/): use the _topic.html_ files to start, and look at the _topic-solution.html_ files if you get stuck.
+
+Of course you are free to skip ahead but I recommend you at least try to code in JS a bit at this point to have the materials sink in quicker.
+
+## Day 3
+
+Watch videos 11-15 about working with the DOM (Document Object Model) - demo code [here](demo/dom) -, debugging, JS gotchas and more resources.
+
+## Day 4
+
+Check out video 16: I got two project apps you can work on today. Depending your expertise and time available, pick one or two:
+
+1. [A simple calculator](demo/calculator) -> [starter template](demo/calculator/index-template.html)
+
+2. [A calorie counter](demo/calories) -> [starter template](demo/calories/js/script-template.js)
+
+You can look at my solutions [here](demo/calculator/index.html) and [here](demo/calories/js/script.js) respectively if you get stuck.
+
+Of course these two projects are *optional*, convenient if you don't have use cases for JS yet.
+
+However if you have some front-end stuff you can work on for your own projects, feel free to do that instead.
+
+The most important is to try to put some of the JS you've learned so far into practice!
+
+---
+
+If you take this course it's likely you do some kind of web development. From full-stack developer to administrating a site, JS is an important skill to have! 
+
+So learn as much as you can these 4 days, it's effort well invested! Good luck and remember: _the learning is in the practice_.
+
+In future lessons you will build upon these skills building apps with 2 popular JS frameworks: Vue.js and React, exciting ...
+
+### Time to share what you've accomplished!
+
+Be sure to share your last couple of days work on Twitter or Facebook. Use the hashtag **#100DaysOfWeb**.
+
+Here are [some examples](https://twitter.com/search?q=%23100DaysOfCode) to inspire you. Consider including [@talkpython](https://twitter.com/talkpython) and [@pybites](https://twitter.com/pybites) in your tweets.
+
+*See a mistake in these instructions? Please [submit a new issue](https://github.com/talkpython/100daysofweb-with-python-course/issues) or fix it and [submit a PR](https://github.com/talkpython/100daysofweb-with-python-course/pulls).*