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

internal/processing/status/fave.go

@@ -76,7 +76,7 @@ func (p *processor) Fave(ctx context.Context, requestingAccount *gtsmodel.Accoun
 			TargetAccount:   targetStatus.Account,
 			StatusID:        targetStatus.ID,
 			Status:          targetStatus,
-			URI:             util.GenerateURIForLike(requestingAccount.Username, p.config.Protocol, p.config.Host, thisFaveID),
+			URI:             util.GenerateURIForLike(requestingAccount.Username, thisFaveID),
 		}
 
 		if err := p.db.Put(ctx, gtsFave); err != nil {