run linkchecker on webserver

ci/script.sh

@@ -3,7 +3,10 @@ set -euxo pipefail
 main() {
     mdbook build
 
-    linkchecker book
+    mdbook serve &
+    sleep 1
+    linkchecker http://localhost:3000
+    kill $!
 }
 
 main

src/intro/install/linux.md

@@ -96,7 +96,7 @@ $ #  ^^^^
 
 If `uucp` appears in the output. You are all set! Go to the [next section]. Otherwise, keep reading:
 
-[next section]: ../verify.html
+[next section]: intro/install/verify.html
 
 - Add yourself to the `uucp` group.
 

src/intro/install/macos.md

@@ -26,4 +26,4 @@ Caskroom/tap` first and try again.
 
 That's all! Go to the [next section].
 
-[next section]: ../verify.html
+[next section]: intro/install/verify.html

src/intro/install/windows.md

@@ -59,4 +59,4 @@ instructions and make sure you install the right (32-bit or 64-bit) version of t
 
 That's all! Go to the [next section].
 
-[next section]: ../verify.html
+[next section]: intro/install/verify.html