General fixes and additions

- Improve readability on larger and smaller screens
- Re-add page signing with a custom script (which is signed of course)
- Posts are now centered on large screens
- <code> now stops overflowing and receives a scrollbar
- The mobile page now stops to overflow

Makefile

@@ -41,5 +41,11 @@ build: ${OPTIMIZED_IMAGES}
 		--include robots.txt \
 		--blog \
 		--rss
-	#python ../shared-assets/pgp-sign.py $(wildcard _site/*.html)
+	python ../shared-assets/pgp-sign.py $(wildcard _site/*.html)
+	gpg \
+		--armor \
+		--output _site/assets/files/verify.sh.sig \
+		--local-user papatutuwawa@polynom.me \
+		--detach-sign \
+		assets/files/verify.sh
 	tar -czf blog.tar.gz _site