add `.env.nu` to load Nushell modules

adds a .env.nu file to load Nushell modules automatically thanks to the nuenv hook from the nu-hooks package.

benchmarks/.nushell/commit/plot.nu

@@ -5,11 +5,12 @@ use ../../../.nushell plot [ into-axis-options, COMMON_OPTIONS, gplt ]
 export def main [data: path, --save: path] {
     check-file $data --span (metadata $data).span
 
-    let graphs = open $data
+    let raw = open $data
         | where name !~ '^SEC'
         | ns-to-ms $.times
         | compute-stats $.times
         | insert degree { get label | parse "degree {d}" | into record | get d | into int }
+    let graphs = $raw
         | rename --column { degree: "x", mean: "y", stddev: "e" }
         | select name x y e
         | group-by name --to-table
@@ -19,11 +20,13 @@ export def main [data: path, --save: path] {
 
     let options = [
         # --title "time to create trusted setups for certain curves"
-        --x-label "degree"
-        --y-label "time (in ms)"
+        --x-label '$\log_2 d$'
+        # --y-label "time"
         ...($graphs.points | flatten | into-axis-options -x "plain" -y "duration")
         ...$COMMON_OPTIONS
         (if $save != null { [ --save $save ] })
+        --x-tick-labels ($raw.degree | uniq | math log 2)
+        --x-ticks-rotation 0
     ]
 
     gplt plot ($graphs | to json) ...($options | flatten | compact)