Add story for Table component

[Coteh]

Addresses the Table story in #954.

Leaving in Draft until these items are done:

• [x] Complete knobs for columns widths and header font size
• [x] Determine whether it's necessary to have knobs for align headers and align body columns
• [ ] Decide whether to transition from knobs to Storybook Controls edit: will address in separate PR
  • Learn more here, I think we should move over to Controls because it seems to be the best practice for Storybook 6 and going forward.
  • I am currently working on adding Storybook Controls in this branch (not ready for PR yet)

This PR also adds Storybook Backgrounds, as I wanted to add the color #fafafa, which is being used underneath the Favourite short links table in the homepage, as a background colour for the canvas. This will make the Table component stand out better. I also set #fafafa as the default background colour for story canvases.

[codecov[bot]]

Codecov Report

Merging #1001 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1001   +/-   ##
=======================================
  Coverage   52.58%   52.58%           
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  Files         142      142           
  Lines        3564     3564           
  Branches      168      168           
=======================================
  Hits         1874     1874           
  Misses       1623     1623           
  Partials       67       67           

Flag	Coverage Δ
#golang	72.03% <ø> (ø)
#typescript	22.40% <ø> (ø)

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

Impacted Files	Coverage Δ
frontend/src/component/ui/Table.tsx	100.00% <ø> (ø)

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[Coteh]

Readied this PR for review, will convert it to Storybook Controls if we start using it.

[magicoder10]

@Coteh Control seems good. Let's do it!

[Coteh]

@byliuyang I think what I'll do is merge this in as-is, then make a separate PR for Controls and convert all existing stories to use Controls in that PR. What do you think?

[Coteh]

@byliuyang Screenshot added