admin: replace header 'Ajouter un TFE' nav link with toolbar button

public/partage/.htaccess

@@ -0,0 +1,28 @@
+# Route all partage requests to index.php
+<IfModule mod_rewrite.c>
+    RewriteEngine On
+    RewriteCond %{REQUEST_FILENAME} !-f
+    RewriteCond %{REQUEST_FILENAME} !-d
+    RewriteRule ^(.*)$ index.php [L]
+</IfModule>
+
+# Security headers
+<IfModule mod_headers.c>
+    Header always set X-Frame-Options "SAMEORIGIN"
+
+    Header always set X-Content-Type-Options "nosniff"
+
+    Header always set X-XSS-Protection "1; mode=block"
+
+    Header always set Referrer-Policy "strict-origin-when-cross-origin"
+
+    Header always set Content-Security-Policy "default-src 'self'; style-src 'self' 'unsafe-inline'; img-src 'self' data:;"
+</IfModule>
+
+# Prevent directory listing
+Options -Indexes
+
+# Protect dotfiles
+<FilesMatch "^\.">
+    Require all denied
+</FilesMatch>