Fix demo mode

[atrovato]

• Fix some bad paths on demo mode
• Delete confusing demo.json file
• Add timer on DemoHttpClient to see loaders.

[codecov]

Codecov Report

Merging #1355 (60046a6) into master (ffde6e0) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1355   +/-   ##
=======================================
  Coverage   96.54%   96.54%           
=======================================
  Files         613      613           
  Lines        8729     8729           
=======================================
  Hits         8427     8427           
  Misses        302      302           

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[Pierre-Gilles]

Oh shit I forgot to delete the demo.json file, my bad!

Nice catch, I'm good for this!

[relativeci]

Job #140: Bundle Size — 6.67MB (+0.07%).

c8d87e2 vs ffde6e0

Changed metrics (2/8)

Metric	Current	Baseline
Initial JS	2.87MB(+0.03%)	2.86MB
Cache Invalidation	46.68%	0%

Changed assets by type (1/7)

	Current	Baseline
JS	4.76MB (+0.09%)	4.76MB

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View Job #140 report on app.relative-ci.com