Rename FAIR to FaIR

[chrisroadmap]

Pull request

Please confirm that this pull request has done the following:

• [x] Tests added
• [x] Documentation added (where applicable)
• [x] Example added (either to an existing notebook or as a new notebook, where applicable)
• [x] Description in CHANGELOG.rst added

Adding to CHANGELOG.rst

(#49 <https://github.com/OMS-NetZero/FAIR/issues/49>) Change name of model to FaIR in docs, README and example notebooks

[codecov[bot]]

Codecov Report

Merging #50 into master will not change coverage. The diff coverage is 100%.

@@           Coverage Diff           @@
##           master      #50   +/-   ##
=======================================
  Coverage   90.47%   90.47%           
=======================================
  Files          33       33           
  Lines        1260     1260           
=======================================
  Hits         1140     1140           
  Misses        120      120

Impacted Files	Coverage Δ
fair/tools/magicc.py	100% <ø> (ø)	:arrow_up:
fair/forcing/aerosols.py	78.26% <100%> (ø)	:arrow_up:

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[znicholls]

pending #51, looks good