Implement Cobra CLI tooling, Viper config tooling (#336)

* start pulling out + replacing urfave and config

* replace many many instances of config

* move more stuff => viper

* properly remove urfave

* move some flags to root command

* add testrig commands to root

* alias config file keys

* start adding cli parsing tests

* reorder viper init

* remove config path alias

* fmt

* change config file keys to non-nested

* we're more or less in business now

* tidy up the common func

* go fmt

* get tests passing again

* add note about the cliparsing tests

* reorganize

* update docs with changes

* structure cmd dir better

* rename + move some files around

* fix dangling comma
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@ -181,6 +181,12 @@ Finally, to run tests against both database types one after the other, use:
./scripts/test.sh
```
### CLI Tests
In [./test/cliparsing.sh](./test/cliparsing.sh) there are a bunch of tests for making sure that CLI flags, config, and environment variables get parsed as expected.
Although these tests *are* part of the CI/CD testing process, you probably won't need to worry too much about running them yourself. That is, unless you're messing about with code inside the `main` package in `cmd/gotosocial`, or inside the `config` package in `internal/config`.
## Project Structure
For project structure, GoToSocial follows a standard and widely-accepted project layout [defined here](https://github.com/golang-standards/project-layout). As the author writes: