p1: /v2/scrape, /v1/fetch, auth, CLI, contract tests

Single Fetcher.Fetch on the Guard that holds DenyPrefixes. skipTlsVerification
is ignored. No 502. keys add writes the secret only to --out. Release binary
has no -test-allow-prefix.

vendor/github.com/JohannesKaufmann/html-to-markdown/v2/internal/domutils/redundant.go

@@ -0,0 +1,29 @@
+package domutils
+
+import (
+	"github.com/JohannesKaufmann/dom"
+	"golang.org/x/net/html"
+)
+
+func RemoveRedundant(doc *html.Node, matchFn func(*html.Node, *html.Node) bool) {
+	for _, node := range dom.AllNodes(doc) {
+		if hasSameTypeAncestor(node, matchFn) {
+			dom.UnwrapNode(node)
+		}
+	}
+
+}
+
+func hasSameTypeAncestor(n *html.Node, matchFn func(*html.Node, *html.Node) bool) bool {
+	if !matchFn(n, n) {
+		return false
+	}
+
+	for p := n.Parent; p != nil; p = p.Parent {
+		if matchFn(n, p) {
+			return true
+		}
+	}
+
+	return false
+}