Merge preview certs into one file

content/.htaccess

@@ -27,9 +27,9 @@ RewriteRule ^U2F/Images/YK5Ci.png$ FIDO/Images/YK5Ci.png [L,R=301]
 RewriteRule ^U2F/Images/YK5NFC-CNFC.png$ FIDO/Images/YK5NFC-CNFC.png [L,R=301]
 RewriteRule ^U2F/Images/YKE.png$ FIDO/Images/YKE.png [L,R=301]
 RewriteRule ^U2F/Images/yubico.png$ FIDO/Images/yubico.png [L,R=301]
-RewriteRule ^U2F/fido-preview-ca-cert-2019.pem$ FIDO/fido-preview-ca-cert-2019.pem [L,R=301]
-RewriteRule ^U2F/fido-preview-ca-cert-2023.pem$ FIDO/fido-preview-ca-cert-2023.pem [L,R=301]
-RewriteRule ^U2F/fido-preview-ca-cert.pem$ FIDO/fido-preview-ca-cert.pem [L,R=301]
+RewriteRule ^U2F/fido-preview-ca-cert-2019.pem$ FIDO/yubico-fido-preview-ca-certs.pem [L,R=301]
+RewriteRule ^U2F/fido-preview-ca-cert-2023.pem$ FIDO/yubico-fido-preview-ca-certs.pem [L,R=301]
+RewriteRule ^U2F/fido-preview-ca-cert.pem$ FIDO/yubico-fido-preview-ca-certs.pem [L,R=301]
 RewriteRule ^U2F/yubico-metadata.json$ FIDO/yubico-metadata.json [L,R=301]
 RewriteRule ^U2F/yubico-u2f-ca-1.pem$ FIDO/yubico-fido-ca-1.pem [L,R=301]
 RewriteRule ^U2F/yubico-u2f-ca-certs.txt$ FIDO/yubico-fido-ca-certs.txt [L,R=301]

content/U2F/Attestation_and_Metadata/index.adoc

@@ -15,7 +15,7 @@ validated. In Yubico's case, all our attestation certificates are signed by
 link:/FIDO/yubico-fido-ca-certs.txt[our root CA]. The same attestation certificate is used for both U2F and WebAuthn.
 
 NOTE: If you have a YubiKey Preview device, the attestation certificate will
-instead be signed by our link:/FIDO/fido-preview-ca-cert-2023.pem[2023Yubico FIDO Preview CA] or link:/FIDO/fido-preview-ca-cert.pem[Yubico FIDO Preview CA (prior to 2023)].
+instead be signed by one of our link:/FIDO/yubico-fido-preview-ca-certs.pem[FIDO Preview CAs].
 
 === Yubico's metadata format
 

static/FIDO/yubico-fido-preview-ca-certs.pem

@@ -0,0 +1,57 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----