refactor: remove features beyond the UX plan

Drop additions that the UX plan does not ask for:

- the interactive label edit form; label edit now requires a flag
- label clone and the skip mode of label creation it needed
- repo rename rewriting the Git remote or tea.repository; it now
  warns that the remote still points to the old name
- the extra "source" remote on clones of pull mirrors
- run artifact download, which duplicates run download --zip
- 256-color and 24-bit label swatches; colors stay ANSI 16
- config list --show-source (config get keeps it)
- the membership and access GETs before team member/repo add and
  remove; Gitea's PUT and DELETE are idempotent

label edit/delete keep --by-name: it is the only way to address a
label whose name is a number that is also another label's ID.

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

internal/app/config.go

@@ -107,11 +107,10 @@ func (a *application) effectivePreferences(snapshot settings.Snapshot) (settings
 	return preferences, sources, nil
 }
 
-// configSetting is one effective setting and where its value comes from.
+// configSetting is one effective setting.
 type configSetting struct {
-	Key    string
-	Value  any
-	Source string
+	Key   string
+	Value any
 }
 
 // settingValues returns the effective preferences, the settings of the selected instance when it is
@@ -242,45 +241,35 @@ $ tea config get ssh_key --host https://gitea.com --user alice`,
 	}
 	get.Flags().BoolVar(&getSource, "show-source", false, "Also print where the value comes from")
 	group.AddCommand(get)
-	var listSource bool
 	list := &cobra.Command{
 		Use: "list", Short: "List settings and their values", Args: argsExact(0),
 		Example: `$ tea config list
-# Include the settings of an instance and where each value comes from
-$ tea config list --host https://gitea.com --show-source`,
+# Include the settings of an instance
+$ tea config list --host https://gitea.com`,
 		RunE: func(cmd *cobra.Command, _ []string) error {
 			snapshot, err := a.deps.Settings.Load()
 			if err != nil {
 				return err
 			}
-			values, sources, err := a.settingValues(snapshot)
+			values, _, err := a.settingValues(snapshot)
 			if err != nil {
 				return err
 			}
 			if a.options.json != "" {
-				return a.writeSettingsJSON(cmd, values, sources, listSource)
+				return a.writeJSON(cmd, values)
 			}
 			items := make([]configSetting, 0, len(values))
 			for _, key := range slices.Sorted(maps.Keys(values)) {
-				items = append(items, configSetting{key, values[key], settingSource(sources, key)})
-			}
-			columns := []terminal.Column{{Header: "Key"}, {Header: "Value", Flex: true}}
-			if listSource {
-				columns = append(columns, terminal.Column{Header: "Source"})
+				items = append(items, configSetting{key, values[key]})
 			}
 			return writeTable(a, cmd, items, listSpec[configSetting]{
-				Columns: columns,
+				Columns: []terminal.Column{{Header: "Key"}, {Header: "Value", Flex: true}},
 				Row: func(item configSetting) []terminal.Cell {
-					row := []terminal.Cell{{Text: item.Key}, {Text: fmt.Sprint(item.Value)}}
-					if listSource {
-						row = append(row, terminal.Cell{Text: item.Source, Muted: true})
-					}
-					return row
+					return []terminal.Cell{{Text: item.Key}, {Text: fmt.Sprint(item.Value)}}
 				},
 			}, listPage{Number: 1})
 		},
 	}
-	list.Flags().BoolVar(&listSource, "show-source", false, "Show where each value comes from")
 	group.AddCommand(list)
 	group.AddCommand(&cobra.Command{
 		Use: "set <key> <value>", Short: "Change a setting", Args: argsExact(2), ValidArgsFunction: a.completeConfig,