Allow docs/make.jl to be run from the root of the repo

[MarkNahabedian]

Add the repo root to LOAD_PATH so that docs/make.jl can be run from the repo root as well as from the docs directory.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.46%. Comparing base (805bb7c) to head (c870211).

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #465       +/-   ##
===========================================
- Coverage   94.33%   77.46%   -16.88%     
===========================================
  Files          24       24               
  Lines         742      741        -1     
===========================================
- Hits          700      574      -126     
- Misses         42      167      +125     

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[oxinabox]

I am not sure about this.
It is one way to do it.
But it's not the only way.

I am much more used to doing ] dev.. and checking in the docs/Manifest.

Or not checking in the manifest and doing that just prior to building.

[gdalle]

Also this changes the global Julia state following docs build which is not ideal

[MarkNahabedian]

My goal is that the current directory not affect the running of docs/make.jl.

I guess it might make more sense to do

cd(@__DIR__)

instead.

As for affecting global Julia state, my admittedly inelastic mind can't forsee a circumstance wehre make.jl is run from other than a stand-alone Julia session created solely for that purpose. Please enlighten me.