Exclude tpflash TeX docs from language stats

[abcdvvvv]

This PR marks *.tex as non-detectable in .gitattributes so GitHub Linguist reports Clapeyron as a 100% Julia repository.

[longemen3000]

I didn't even know you can, do this, nice!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.67%. Comparing base (49b283a) to head (f7f0d4f).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #547      +/-   ##
==========================================
- Coverage   77.71%   77.67%   -0.04%     
==========================================
  Files         372      370       -2     
  Lines       33004    32901     -103     
==========================================
- Hits        25648    25555      -93     
+ Misses       7356     7346      -10     

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[abcdvvvv]

Hi @longemen3000, I still see 0.1% of the TeX files displayed on the homepage. You can modify the .gitattributes file to

test/tpflash/*.tex linguist-generated=true

and try again. Hopefully it will work this time.