[fix] remove lazy-loading for the images on above-the-fold area and remove CSS aspect-ratio and add transitions to lazy-loaded images

[anton-karlovskiy]

I think we should not lazy-load the images which are within the above-the-fold area for UX.

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[anton-karlovskiy]

@pi0 @addyosmani
Re: #26 (comment)

I'm going to remove the aspect ratio by the original CSS as we have nuxt-img module landed and add transitions to the lazy-loaded images using Vue.js transition when they appear (lazy-loaded).

[anton-karlovskiy]

@pi0 @danielroe @addyosmani

I'm going to go ahead and merge this PR although we have not solved the following issues:
#35
#33
#30 (comment)

[pi0]

Thanks for merging @anton-karlovskiy was going to need it :D