Improve installation documentation with CMake

[iomaganaris]

• Mention issue in compilation with NMODL_ENABLE_PYTHON_BINDINGS
• Remove mentions to BlueBrain/CoreNEURON github
• Added NMODL CMake options

[azure-pipelines]

✔️ d641b06 -> Azure artifacts URL

[codecov]

Codecov Report

Merging #2552 (d641b06) into master (8985d2b) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2552      +/-   ##
==========================================
- Coverage   61.49%   61.48%   -0.02%     
==========================================
  Files         623      623              
  Lines      119163   119163              
==========================================
- Hits        73281    73264      -17     
- Misses      45882    45899      +17     

see 9 files with indirect coverage changes

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[bbpbuildbot]

Logfiles from GitLab pipeline #156665 (:white_check_mark:) have been uploaded here!

Status and direct links:

• ✅ mac_m1_cmake_build: [cmake, ON, OFF, OFF, address]
• ✅ spack_setup
• ✅ build:nmodl
• ✅ build:neuron:nmodl:intel:legacy
• ✅ build:neuron:nmodl:intel:shared
• ✅ build:neuron:nmodl:nvhpc:acc:legacy
• ✅ build:neuron:nmodl:nvhpc:acc:shared
• ✅ build:neuron:nmodl:nvhpc:omp:legacy
• ✅ build:neuron:nmodl:nvhpc:omp
• ✅ test:neuron:nmodl:intel:legacy
• ✅ test:neuron:nmodl:intel:shared
• ✅ test:neuron:nmodl:nvhpc:acc:legacy
• ✅ test:neuron:nmodl:nvhpc:acc:shared
• ✅ test:neuron:nmodl:nvhpc:omp:legacy
• ✅ test:neuron:nmodl:nvhpc:omp