chore: rewrite uses of cs.tvl.fyi to code.tvl.fyi

I've checked the new links manually.

- //web/tvl: changed the target path of links to the tvix docs since
  they were moved in r/2378.

- //users/aspen/resume: Tvix is no longer //third_party/nix.

Change-Id: I419bae1a46bdccc7baa7327215aa2368ffc0f01c
Reviewed-on: https://cl.tvl.fyi/c/depot/+/13043
Reviewed-by: aspen <root@gws.fyi>
Tested-by: BuildkiteCI
Autosubmit: sterni <sternenseemann@systemli.org>
Reviewed-by: fogti <fogti+devel@ytrizja.de>
Reviewed-by: tazjin <tazjin@tvl.su>

users/aspen/resume/resume.tex

@@ -230,10 +230,10 @@ SQL from the ground up -- and of course also a user}
     {\url{https://blog.readyset.io/bounds-checks/}}{Blog post providing a deep
         evaluation of the runtime cost of bounds checking in safe languages like Rust.
         Front page of Hacker News, doubled month-over-month ReadySet waitlist signups}
-    \project{Tvix}{\url{https://cs.tvl.fyi/depot/-/blob/third\_party/nix/README.md}}{
-        Fork of the Nix build tool delivering increased reliability, code
-        quality, and pluggability}
-    \project{Panettone}{\url{https://cs.tvl.fyi/depot/-/tree/web/panettone}}{
+    \project{Tvix}{\url{https://tvix.dev}}{
+        % TODO(aspen): and now in your own words :)
+        Modular Reimplementation of the Nix build tool in Rust}
+    \project{Panettone}{\url{https://code.tvl.fyi/tree/web/panettone}}{
         Aggressively simple bug-tracker developed in Common Lisp for the community
         involved in the development of Tvix. Hosted at https://b.tvl.fyi}
     \project{Org-Clubhouse}{\url{https://github.com/glittershark/org-clubhouse}}{