Remove the CrowdSec decision feed (closes #315)

sneak ruled to remove it. Gone: the heuristic crowdsec, the ban cause
crowdsec and its earlier_bans count, the tag crowdsec, the settings
SWW_WAF_CROWDSEC_LAPI_URL and SWW_WAF_CROWDSEC_LAPI_KEY, the decision
list fetch and parse in internal/reputation, their tests, and every
mention in the README, SPEC.md and docs/. EVALUATION.md keeps its
comparison of tools.

The ban ledger's internal ban function loses its expires parameter,
which only CrowdSec bans used.

Model: opus-5-5

internal/reputation/export_test.go

@@ -11,7 +11,6 @@ import (
 // network.
 func (l *Lists) SetTransport(transport http.RoundTripper) {
 	l.httpClient.Transport = transport
-	l.crowdSecClient.Transport = transport
 }
 
 // SetTransport has a's checks go through transport instead of the