Add .gif support to webpack.config.js

[adviva]

Questions	Answers
Branch?	develop
Description?	When compiling the assets it will trigger errors if using .gif files.
Type?	bug fix
Category?	FO
BC breaks?	no
Deprecations?	no
Fixed ticket?
How to test?	Use a .gif file inside img theme folder.

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This change is 

[prestonBot]

Hello @adviva!

This is your first pull request on the PrestaShop project. Thank you, and welcome to this Open Source community!

[Quetzacoalt91]

Hi @adviva,

Thanks, this change makes sens regarding your error. But is it needed to include in in the core?
We do not provide gif files with the source code, and theme developers are recommended to create a new child theme from classic instead of modifying it directly. By doing so, they can reuse a parent theme (here, classic) without being tied to it.

In consequence, if you have gif files in your own theme, you should use your own webpack configuration.

[adviva]

So you are assuming any node_module package required in package.json won't use .gif?

We suggest this as core implementation to avoid annoying errors from the first classic override. (Eg. by installing something like fancybox etc...).

[PierreRambaud]

Agreed with @adviva wait for @eternoendless feedback, he is the Webpack master 😁

[eternoendless]

LGTM

[PierreRambaud]

Thanks @adviva