Improve readme

[relu91]

This PR tries to improve the main node-wot readme to provide more background information and easier to follow structure. It also adds the Thingweb logo at the top of the readme. Feel free to suggest any changes.

[relu91]

Two issues:

1. 
2. webpack config file that I need to remove (sorry it was in another branch)

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (1f71e3f) 75.71% compared to head (e8ba7c6) 75.67%.
Report is 25 commits behind head on master.

❗ Current head e8ba7c6 differs from pull request most recent head f5a5b6a. Consider uploading reports for the commit f5a5b6a to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1114      +/-   ##
==========================================
- Coverage   75.71%   75.67%   -0.04%     
==========================================
  Files          80       80              
  Lines       16108    16159      +51     
  Branches     1507     1520      +13     
==========================================
+ Hits        12196    12229      +33     
- Misses       3874     3888      +14     
- Partials       38       42       +4     

see 10 files with indirect coverage changes

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[relu91]

Just rebased removing the webpack file. I also fixed the logo 👍🏻