fix: show all alerts by default

This was confusing for new users when some of their rules appear to not be working.

internal/core/config.go

@@ -232,7 +232,7 @@ func NewConfig(flags *CLIFlags) (*Config, error) {
 	cfg.Formats = make(map[string]string)
 	cfg.Asciidoctor = make(map[string]string)
 	cfg.GChecks = make(map[string]bool)
-	cfg.MinAlertLevel = 1
+	cfg.MinAlertLevel = 0
 	cfg.RuleToLevel = make(map[string]string)
 	cfg.SBaseStyles = make(map[string][]string)
 	cfg.SChecks = make(map[string]map[string]bool)

testdata/features/checks.feature

@@ -86,6 +86,9 @@ Feature: Checks
         When I test "checks/Existence"
         Then the output should contain exactly:
             """
+            test.md:3:6:write-good.E-Prime:Avoid using "is"
+            test.md:7:4:write-good.E-Prime:Avoid using "Here's"
+            test.md:9:6:write-good.E-Prime:Avoid using "is"
             test.md:9:28:vale.Spacing:Use exactly one space between sentences and clauses. Check 'e.A' for spacing problems.
             """