Improve logging (#116)

- Actually log useful information at their respective log level.
- Add logs in hot-paths to be able to deep-dive and debug specific requests (see server/handler.go)
- Add more information to existing fields(e.g. the host that the user is visiting, this was noted by @fnetX).

Co-authored-by: Gusted <williamzijl7@hotmail.com>
Reviewed-on: https://codeberg.org/Codeberg/pages-server/pulls/116
Reviewed-by: 6543 <6543@noreply.codeberg.org>
Co-authored-by: Gusted <gusted@noreply.codeberg.org>
Co-committed-by: Gusted <gusted@noreply.codeberg.org>

server/setup.go

@@ -2,11 +2,11 @@ package server
 
 import (
 	"bytes"
+	"fmt"
 	"net/http"
 	"time"
 
 	"github.com/rs/zerolog/log"
-
 	"github.com/valyala/fasthttp"
 
 	"codeberg.org/codeberg/pages/server/cache"
@@ -16,7 +16,7 @@ import (
 type fasthttpLogger struct{}
 
 func (fasthttpLogger) Printf(format string, args ...interface{}) {
-	log.Printf("[FASTHTTP] "+format, args...)
+	log.Printf("FastHTTP: %s", fmt.Sprintf(format, args...))
 }
 
 func SetupServer(handler fasthttp.RequestHandler) *fasthttp.Server {