Clean up codebase
I'm getting to know the codebase while simultaneously cleaning it a bit
- deleted redundant comments (go-lint, which is the tool which was forcing adding comments to every exported identifier, is deprecated. No need for dummy comments now)
- deleted redundant
doc.go
files (if the docs aren't very big, it's non-idiomatic to create a separatedoc.go
file) - clean up
go.mod