Replace cusotm image loader with `object-fit` CSS

Because of this, images had to be changed to load async, else pages are crazy intensive to load
7 jobs for master in 3 minutes and 32 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Install
passed install #164

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passed install #159

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  Build
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failed build #160

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failed build #163

 
  Test
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  Deploy
passed deploy #162

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