Show release version in Footer

[fiskus]

• Get stackVersion from /config.js and show it in a footer

Also:

• Converted Notification.js and Footer.js to typescript

• Changelog entry (skip if change is not significant to end users, e.g. docs only)

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 15 lines in your changes missing coverage. Please review.

Project coverage is 37.68%. Comparing base (7972243) to head (b0d92f6).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
catalog/app/components/Footer/Footer.tsx	0.00%	7 Missing ⚠️
...alog/app/containers/Notifications/Notification.tsx	0.00%	7 Missing ⚠️
catalog/app/components/Layout/Layout.tsx	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4200      +/-   ##
==========================================
- Coverage   37.69%   37.68%   -0.01%     
==========================================
  Files         768      768              
  Lines       35317    35321       +4     
  Branches     5215     5214       -1     
==========================================
- Hits        13313    13312       -1     
- Misses      20769    20775       +6     
+ Partials     1235     1234       -1     

Flag	Coverage Δ
api-python	91.09% <ø> (ø)
catalog	12.07% <0.00%> (-0.01%)	⬇️
lambda	87.95% <ø> (ø)

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[nl0]

i'd go with the config.js approach for the sake of simplicity.
it's kinda debatable whether this data belongs to the config conceptually, but i think it's an okay compromise in this specific case

[nl0]

looks good, some nitpicks inline