Labeling `good first issue` in the git repository

[atishay]

For any Hugo users trying to learn go and contribute to Hugo, the starting point provided by https://gohugo.io/contribute/development/ is very useful. But it does miss some good issues that first time contributors could contribute to Hugo. It will be great if we have some issues scrubbed and labeled as good first issues. I would love to learn a bit of Go and contribute (seasoned JS and C++ developer. Never done Go before).