doc: hydrogen combustion example blank page removed

[vdevgan]

Changes proposed in this pull request:

• "hydrogen combustion reaction " page in doc was empty.
  that has been removed.

[bryanwweber]

This is being tracked in #313, where the solution is to add the example rather than removing the page

[vdevgan]

could I be shown another example in the doc or elsewhere to know in what specific format is the example to be filled?

[bryanwweber]

The example in question is on pg. 55 of the PDF linked in #313. Other examples can be found in https://github.com/Cantera/cantera/tree/master/interfaces/cython/cantera/examples for Python and https://github.com/Cantera/cantera/tree/master/samples/matlab for Matlab. Note that the script in the PDF is a Matlab script, but we would prefer to have either Python or both Python and Matlab. You can also directly use the h2o2.xml file as the chemistry file, rather than a subset of GRI-3.0 as in the PDF.

[speth]

I'm inclined to accept the solution of just removing the blank page, since it's not clear that those examples really belong as part of the CTI documentation anyway. The only change needed to this PR is that the entry in index.rst also needs to be removed. Issue #313 should remain open as a reminder that those examples have not been migrated.

[vdevgan]

combustion example reference from cti/ index.rst has been removed.

[codecov]

Codecov Report

Merging #518 into master will increase coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #518      +/-   ##
==========================================
+ Coverage   64.78%   64.78%   +<.01%     
==========================================
  Files         383      383              
  Lines       40734    40736       +2     
==========================================
+ Hits        26390    26392       +2     
  Misses      14344    14344

Impacted Files	Coverage Δ
src/base/stringUtils.cpp	74.8% <0%> (ø)	⬆️
src/equil/ChemEquil.cpp	75.75% <0%> (+0.03%)	⬆️
include/cantera/cython/wrappers.h	87.03% <0%> (+0.24%)	⬆️

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