Read-only detail views

[szewczykmira]

Closes #958
Closes #1011

[codecov-io]

Codecov Report

Merging #966 into master will decrease coverage by 0.23%.
The diff coverage is 39.43%.

@@            Coverage Diff             @@
##           master     #966      +/-   ##
==========================================
- Coverage   63.65%   63.42%   -0.24%     
==========================================
  Files         106      107       +1     
  Lines        5869     5979     +110     
  Branches      729      741      +12     
==========================================
+ Hits         3736     3792      +56     
- Misses       1994     2049      +55     
+ Partials      139      138       -1

Impacted Files	Coverage Δ
saleor/dashboard/product/urls.py	100% <ø> (ø)	⬆️
saleor/dashboard/customer/views.py	50% <ø> (ø)	⬆️
saleor/dashboard/category/views.py	23.88% <0%> (ø)	⬆️
saleor/dashboard/order/views.py	39.66% <0%> (ø)	⬆️
saleor/dashboard/product/api.py	58.13% <0%> (ø)	⬆️
saleor/product/utils.py	82.92% <100%> (+3.51%)	⬆️
saleor/dashboard/shipping/urls.py	90.47% <100%> (ø)	⬆️
saleor/dashboard/shipping/views.py	33.33% <12.5%> (-2.57%)	⬇️
saleor/dashboard/product/views.py	18.62% <18.44%> (+0.8%)	⬆️
saleor/dashboard/templatetags/utils.py	52.38% <33.33%> (-3.18%)	⬇️
... and 5 more

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[subgrafik]

@Product view

Product > Variant View

Status states:

• "ready for purchase" - available and in stock
• "stock running low" - available in stock but one or more variants are not available
• "out of stock" - not available
• "not carried" - no records in stock
• "variants missing" - no variants
• "not yet available" - available but not current time
• "not published" - SWITCH IS OFF

Actions
all EDIT buttons → new page form
DELETE → modal
ADD → new page form
SELECT IMAGES (variant) → modal with select

click on stock record line → new page form
on stock edit there is no form for switching stock

Stock - when allocation is higher or same as stock use red color for allert

[maarcingebala]

We've finished implementation of detail views related to products. A few screenshots showing how they look:

Product details:

Variant details:

Variant images selection:

Stock record details:

[patrys]

Can we add coverage for the newly introduced template tags?