Feature/dark mode #354

[tswinb]

Description

Updates styling to allow for dark mode.
Needs to be run in conjunction with ral-facilities/scigateway#355

Testing instructions

Test with ral-facilities/scigateway#355

• Review code
• Check Travis build
• Review changes to test coverage

Agile board tracking

connect to ral-facilities/scigateway#354

[codecov]

Codecov Report

Merging #357 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #357   +/-   ##
=======================================
  Coverage   99.00%   99.01%           
=======================================
  Files          87       87           
  Lines        3333     3338    +5     
  Branches      620      620           
=======================================
+ Hits         3300     3305    +5     
  Misses         30       30           
  Partials        3        3           

Flag	Coverage Δ
#common	99.11% <100.00%> (+<0.01%)	⬆️
#dataview	99.45% <100.00%> (+<0.01%)	⬆️
#download	98.98% <100.00%> (+<0.01%)	⬆️
#search	97.64% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...s/datagateway-common/src/table/table.component.tsx	100.00% <ø> (ø)
...datagateway-dataview/src/breadcrumbs.component.tsx	99.04% <ø> (ø)
packages/datagateway-search/src/App.tsx	92.00% <ø> (ø)
...teway-search/src/searchPageContainer.component.tsx	100.00% <ø> (ø)
...ackages/datagateway-search/src/searchPageTable.tsx	90.90% <ø> (ø)
...teway-common/src/preloader/preloader.component.tsx	100.00% <100.00%> (ø)
...tagateway-dataview/src/pageContainer.component.tsx	100.00% <100.00%> (ø)
...download/src/downloadTab/downloadTab.component.tsx	93.93% <100.00%> (+0.18%)	⬆️

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