feat(repo): show repository columns, state and README

repo list and search repo printed bare names. They now render a table
with NAME, DESCRIPTION, INFO (public or private, fork, mirror, template,
archived, empty) and UPDATED under "Showing N of M repositories ...", an
empty-state message on stderr, and tab-separated rows with the URL when
piped. --type, --sort and --order complete and validate their values.

repo view shows the visibility and kind badges, stars, forks, open
issues and pull requests, the parent of a fork, the source of a mirror,
the default branch and the clone URLs, followed by the README of the
default branch (or --branch), rendered on a terminal. The repository
JSON gains empty, stars_count, forks_count, open_issues_count,
open_pr_count, topics and updated_at.

Signed-off-by: bircni <bircni@icloud.com>

internal/app/app_test.go

@@ -511,13 +511,10 @@ const (
 	repo delete
 	repo edit
 	repo fork
-	repo list
 	repo migrate
 	repo set-default
-	repo view
 	search issue
 	search pr
-	search repo
 	status
 	time create
 	time delete
@@ -543,8 +540,6 @@ const (
 	pr comment
 	release
 	release asset
-	repo
-	search
 	time
 	wiki
 `