Add submit slider and email validation (#549)

- Add the slider as a challenge for form submission
- Add email validation using browser's inbuilt functionality
14 jobs for master in 6 minutes and 41 seconds (queued for 10 seconds)
Status Job ID Name Coverage
  Test Build Static
passed #536535
Test_N_Build

00:04:33

passed #536536
Test_N_Build:internal

00:04:33

 
  Build Docker Images
passed #536539
Nginx:Internal

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passed #536537
Nginx:Live

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passed #536540
Node:Internal

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passed #536538
Node:Live

00:01:55

 
  Deploy
passed #536547
Internal:HL

00:00:11

passed #536545
Internal:HX

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passed #536543
Live:HL

00:00:09

passed #536541
Live:HX

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passed #536548
Pub:Internal-HL

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passed #536546
Pub:Internal-HX

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passed #536544
Pub:Live-HL

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passed #536542
Pub:Live-HX

00:00:07