Enable eslint indent rule

[vincentfretin]

Description:

I added a prettier config in #5665 that applies 2 spaces indent only for html and js inside the html for new contributed examples.
For js files that 2 spaces indent wasn't enforced.

Changes proposed:

• Enable the eslint indent rule to use 2 spaces in js files, use proper options to minimize code changes
• Fix all indent errors

[dmarcos]

This rule makes the code less legible. It's good to be able to break a complicated list of parameters passed to a function in multiple lines

[vincentfretin]

We have the same line in one other place in this file, so I decided to do the same for this one, but I can do the other way around, put it in several lines at both places.
The indent rule with "CallExpression": { "arguments": "first" } allowing to align the other lines on the same position as the first argument just warned about 1 missing space indentation for this particular case.
I fixed it in the next commit, you're right that's more readable.

[dmarcos]

Thanks!