* Adding proper solution for spread operation
Use the Spread Operator to Evaluate Arrays In-Place: adding the proper solution for the challenge
* made some more changes
* Fixed the Solution in es6 class constructor guide
Fixed the vegetable solution in Guide: Use class Syntax to Define a Constructor Function
- Remove image of phantom
- Remove notes for contributors
- Links to bottom and to markdown + some more
- Alternative code solution
### Notes:
- The guide article mentions the challenge can be solved by using `reduce()` but I couldn't find a way to do so. It might be better to remove that reference and the bottom link until someone provides one.
- The alternative code solution I provided uses a simpler way (in my opinion) to check if the values are integers but does not differ much from the original one. If necessary, feel free to remove it and go on with just the fixes.
* Translate challenge subtitles and example challenge text to Spanish
* Corrected errors in syntax and punctuation
* Multiple corrections of it/s to its plus other grammar corrections
* Correction and added paragraph to CSS Flex article
* Corrected my own typo
* Corrected capitalization, American spellings and typos
