remove partners list and map

[clare-stanton]

Removing partners list and map from About page because it is outdated and would be visually overcrowded and not useful if it we were to fully update it.

[codecov[bot]]

Codecov Report

Merging #3362 (0d06791) into develop (2e1d8e0) will decrease coverage by 0.23%. The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop    #3362      +/-   ##
===========================================
- Coverage    70.01%   69.79%   -0.23%     
===========================================
  Files           52       50       -2     
  Lines         6993     6945      -48     
===========================================
- Hits          4896     4847      -49     
- Misses        2097     2098       +1     

Impacted Files	Coverage Δ
perma_web/perma/views/common.py	82.28% <100.00%> (-0.26%)	:arrow_down:

... and 1 file with indirect coverage changes

[rebeccacremona]

Ah, thank you, tests, for failing: @clare-stanton the landing page also has a registrar logo carousel, we did not remember. I will remove it too.