Add instrument landing pages #1779

[louise-davies]

Description

Add instrument landing pages. I made them generic so they can be used for both ISIS and DLS - to do this I made the branding component generic, and made a config option to configure the logo. It can either be a custom logo by providing a path via a string or STFC or DLS will render the STFC or DLS logos respectively (aka old branding component behaviour).

Testing instructions

Add a set up instructions describing how the reviewer should test the code

• Review code
• Check Actions build
• Review changes to test coverage
• Test instrument landing pages work. Maybe test with ISIS dev to test PID rendering works (and soon start/end dates should work once I add them to ISIS dev)

Agile board tracking

Closes #1779

[codecov]

Codecov Report

❌ Patch coverage is 99.34641% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 96.73%. Comparing base (4cbfd83) to head (306a9cf).
⚠️ Report is 2 commits behind head on develop.

Files with missing lines	Patch %	Lines
...s/datagateway-dataview/src/state/actions/index.tsx	81.81%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           develop    #1960    +/-   ##
=========================================
  Coverage    96.72%   96.73%            
=========================================
  Files          220      221     +1     
  Lines        31297    31442   +145     
  Branches      4707     4741    +34     
=========================================
+ Hits         30271    30414   +143     
  Misses        1023     1023            
- Partials         3        5     +2     

Flag	Coverage Δ
common	95.48% <ø> (ø)
dataview	98.49% <99.34%> (+<0.01%)	⬆️
download	96.92% <ø> (ø)
search	95.64% <ø> (ø)

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