Remove tune_cnn.ipynb; fix broken link

[esantorella]

The material in tune_cnn.ipynb is redundant with the material in tune_cnn_service.ipynb. It is also creating a link because the tutorials.json markdown file points to the latter tutorial, while tutorials/index.js points to the former. This PR removes tune_cnn.ipynb and fixes the broken link by having both point to tune_cnn_service.ipynb.

I also removed an unused variable in index.js.

Test plan

I built tutorials tutorials locally and served the website with ./scripts/make_docs.sh and confirmed that the link works now.

[facebook-github-bot]

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (46418da) 94.46% compared to head (6b71e55) 94.46%.

❗ Current head 6b71e55 differs from pull request most recent head 74943e2. Consider uploading reports for the commit 74943e2 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1980   +/-   ##
=======================================
  Coverage   94.46%   94.46%           
=======================================
  Files         460      460           
  Lines       44032    44032           
=======================================
  Hits        41595    41595           
  Misses       2437     2437           

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[facebook-github-bot]

@esantorella merged this pull request in 1186380.