Improve logging

- 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)
- Remove zerologger and instead use custom logger that doesn't log
JSON (directly inspired by https://codeberg.org/Codeberg/moderation/pulls/7).
- Add more information to existing fields(e.g. the host that the user is
visiting, this was noted by @fnetX).

server/database/setup.go

@@ -7,10 +7,10 @@ import (
 	"fmt"
 	"time"
 
+	"codeberg.org/codeberg/pages/server/log"
 	"github.com/akrylysov/pogreb"
 	"github.com/akrylysov/pogreb/fs"
 	"github.com/go-acme/lego/v4/certificate"
-	"github.com/rs/zerolog/log"
 )
 
 var _ CertDB = aDB{}
@@ -72,7 +72,7 @@ func (p aDB) sync() {
 	for {
 		err := p.intern.Sync()
 		if err != nil {
-			log.Err(err).Msg("Syncing cert database failed")
+			log.Error("Syncing cert database failed: %v", err)
 		}
 		select {
 		case <-p.ctx.Done():