Added tracker for main contributor to footer

[mjh316]

Modified gitstamp.py and footer.html as mentioned in #746 to keep track of the main contributor for each page on the footer.

[netlify[bot]]

✔️ Deploy Preview for nemtech ready! Built without sensitive environment variables

🔨 Explore the source changes: 0bd56bf2744559a3a335b91b26b6a762e6950eb3

🔍 Inspect the deploy log: https://app.netlify.com/sites/nemtech/deploys/61cf5e7dd877d100095a7a95

😎 Browse the preview: https://deploy-preview-748--nemtech.netlify.app

[mjh316]

I've modified the code to handle the case where git.shortlog returns an empty string, but this always happens. Is there any specific configuration that's different for the netlify build vs local besides GITHUB_TOKEN being provided that would be related?

[mjh316]

Error seems to occur due to lack of .git folder in deployment. Will have to try another method besides using the global g git.Repo object.