Add security.txt file

Fix security.txt blogpost

content/posts/2020-04-25_securitytxt.md

 ---
 title: Découverte du security.txt 
 slug: decouverte-security-txt
-date: 2020-04-25
+date: 2020-04-26
 categories: Infosec
 ---
 
@@ -42,7 +42,7 @@ Voici par exemple le fichier `security.txt` pour ce site :
 ```text
 Canonical: https://y0no.fr/.well-known/security.txt
 Contact: mailto:security@y0no.fr
-Encryption: 
+Encryption: https://y0no.fr/key.gpg
 Preferred-Languages: en, fr
 ```
 
@@ -55,7 +55,7 @@ Hash: SHA256
 
 Canonical: https://y0no.fr/.well-known/security.txt
 Contact: mailto:security@y0no.fr
-Encryption: 
+Encryption: https://y0no.fr/key.gpg
 Preferred-Languages: en, fr
 -----BEGIN PGP SIGNATURE-----
 <...>

static/.well-known/security.txt.asc

+-----BEGIN PGP SIGNED MESSAGE-----
+Hash: SHA256
+
+Canonical: https://y0no.fr/.well-known/security.txt
+Contact: mailto:security@y0no.fr
+Encryption: https://y0no.fr/key.gpg
+Preferred-Languages: en, fr
+-----BEGIN PGP SIGNATURE-----
+
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+=pPq7
+-----END PGP SIGNATURE-----

static/key.gpg

+-----BEGIN PGP PUBLIC KEY BLOCK-----
+
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+=G7l+
+-----END PGP PUBLIC KEY BLOCK-----
\ No newline at end of file