propagate default dpi=72 and PDF to images cap = 1800 (30m)

.env.example

@@ -4,9 +4,9 @@ S3_USE_SSL=false
 S3_ACCESS_KEY=minioadmin
 S3_SECRET_KEY=minioadmin
 S3_SESSION_TTL_SECONDS=3600
-CONVERSION_IMAGE_DPI=150
+CONVERSION_IMAGE_DPI=72
 CONVERSION_PPTX_TO_PDF_TIMEOUT_SECONDS=180
-CONVERSION_PDF_TO_IMAGES_TIMEOUT_SECONDS=600
+CONVERSION_PDF_TO_IMAGES_TIMEOUT_SECONDS=1800
 CONVERSION_PPTX_TO_PDF_BASE_TIMEOUT_SECONDS=45
 CONVERSION_PPTX_TO_PDF_PER_SLIDE_TIMEOUT_SECONDS=3
 CONVERSION_PDF_TO_IMAGES_BASE_TIMEOUT_SECONDS=30