4th tutorial video review

[Tedoshiii]

• Please use the following link for reviews: https://murf.ai/share/lm6azmy3
• Applied the requested fixes mentioned in issue #152

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[egekorkan]

The original issue is fixed and I will mark it in #152. The IDE theme will be also fixed in this PR, following the rules at #160

[egekorkan]

Also at 3:19 there is no indentation for the JSON objects. Also JSON_example should be just called example.json as shown in the IDE.

[egekorkan]

169 takes over the changes here