Remove what is about deploying behind Gitea (closes #209)

Delete the Gitea compose setup, its document, its two scripts and their
make targets. Documents and tests no longer use Gitea as the example
deployment. The Core Rule Set exclusions for Gitea's false positives in
internal/waf stay, with their comments and tests.

Model: opus-5-5

internal/alerts/alerts_test.go

@@ -39,7 +39,7 @@ const (
 	ntfyURL    = "https://ntfy.example/smallwebwaf-alerts"
 	ntfyToken  = "tk_0123456789abcdefghijklmnopq"
 	// instance is the instance name every alert gives.
-	instance = "fsn1app1/gitea"
+	instance = "fsn1app1/blog"
 	// started is when each test starts, as an alert gives it, and
 	// anHourOn an hour later.
 	started  = "2000-01-01T00:00:00Z"
@@ -965,8 +965,8 @@ func TestEachDestinationIsSentOnlyTheAlertsWaitingForIt(t *testing.T) {
 		synctest.Wait()
 
 		wantBodies(t, standIns[alerts.DestinationSlack],
-			`{"text":"*fsn1app1/gitea: file_error*\nsecond"}`,
-			`{"text":"*fsn1app1/gitea: file_error*\nthird"}`)
+			`{"text":"*fsn1app1/blog: file_error*\nsecond"}`,
+			`{"text":"*fsn1app1/blog: file_error*\nthird"}`)
 		wantBodies(t, standIns[alerts.DestinationNtfy], "fourth")
 
 		// alerts.json then lists Slack and ntfy alone, with no alert waiting.
@@ -1265,7 +1265,7 @@ func anAlertForEachEvent() []eventMessage {
 				Reason: "requests per hour over the limit of 10000",
 				Detail: map[string]any{"mode": "observe"},
 			},
-			"fsn1app1/gitea: ban", "default no_entry",
+			"fsn1app1/blog: ban", "default no_entry",
 			"requests per hour over the limit of 10000\nclient: 203.0.113.9\n" +
 				"netblock: 203.0.113.0/24\ncountry: DE\nmode: observe",
 		},
@@ -1275,7 +1275,7 @@ func anAlertForEachEvent() []eventMessage {
 				Netblock: netip.MustParsePrefix("198.51.100.7/32"), Country: "FR",
 				Reason: "matched the rule env-file",
 			},
-			"fsn1app1/gitea: permanent_ban", "high no_entry",
+			"fsn1app1/blog: permanent_ban", "high no_entry",
 			"matched the rule env-file\nclient: 198.51.100.7\n" +
 				"netblock: 198.51.100.7/32\ncountry: FR",
 		},
@@ -1286,7 +1286,7 @@ func anAlertForEachEvent() []eventMessage {
 				Reason:   "refused by the Core Rule Set",
 				Host:     "app.example",
 			},
-			"fsn1app1/gitea: waf_block", "default shield",
+			"fsn1app1/blog: waf_block", "default shield",
 			"refused by the Core Rule Set\nhost: app.example\nclient: 192.0.2.1\n" +
 				"netblock: 192.0.2.1/32",
 		},
@@ -1295,7 +1295,7 @@ func anAlertForEachEvent() []eventMessage {
 				Event: alerts.EventAnomaly, Netblock: netip.MustParsePrefix("192.0.2.0/24"),
 				Reason: "requests per minute over the threshold of 5000",
 			},
-			"fsn1app1/gitea: anomaly", "high chart_with_upwards_trend",
+			"fsn1app1/blog: anomaly", "high chart_with_upwards_trend",
 			"requests per minute over the threshold of 5000\nnetblock: 192.0.2.0/24",
 		},
 		{
@@ -1304,7 +1304,7 @@ func anAlertForEachEvent() []eventMessage {
 				Netblock: netip.MustParsePrefix("192.0.2.2/32"),
 				Reason:   "listed by a DNS blocklist",
 			},
-			"fsn1app1/gitea: reputation_hit", "low label",
+			"fsn1app1/blog: reputation_hit", "low label",
 			"listed by a DNS blocklist\nclient: 192.0.2.2\nnetblock: 192.0.2.2/32",
 		},
 		{
@@ -1312,7 +1312,7 @@ func anAlertForEachEvent() []eventMessage {
 				Event: alerts.EventSourceFailure, Reason: "asking GeoJS failed",
 				Detail: map[string]any{"source": "geojs"},
 			},
-			"fsn1app1/gitea: source_failure", "high warning",
+			"fsn1app1/blog: source_failure", "high warning",
 			"asking GeoJS failed\nsource: geojs",
 		},
 		{
@@ -1323,7 +1323,7 @@ func anAlertForEachEvent() []eventMessage {
 					"file": "/etc/smallwebwaf/rules.d/50-app.rules", "error": "line 2: no action",
 				},
 			},
-			"fsn1app1/gitea: file_error", "high warning",
+			"fsn1app1/blog: file_error", "high warning",
 			"a rule file has an error, and the rules stay as they were\n" +
 				"file: /etc/smallwebwaf/rules.d/50-app.rules\nerror: line 2: no action",
 		},