Port root before_v0.60/*.nu scripts (issue #221) (#837)

This PR is part of porting all old scripts #221 and ports all root
`before_v0.60/*.nu` scripts to `modules/*.nu`

modules/lint_directories.nu

@@ -0,0 +1,16 @@
+# List any directory that does not follow a SemVer naming pattern
+# For example
+# - 1.0.1 is a valid directory name.
+# - yeah_whatever_linter is not a valid directory name.
+def ls-incorrect-dirs [] {
+    ls | where type == dir and name != 'scripts' | find --invert --regex '(\d+\.){2,}\d$' --columns [name]
+}
+let incorrect_count = (ls-incorrect-dirs | length);
+if $incorrect_count > 0 {
+    print $"The following directories are named incorrectly: (char newline)"
+    print (ls-incorrect-dirs)
+    exit 1
+
+} else {
+    exit 0
+}

modules/maintainer_time.nu

@@ -0,0 +1,18 @@
+let m_table = (
+    [
+    ['name', 'tz', 'time'];
+    ['andres' 'America/Guayaquil' ' ']
+    ['fdncred' 'US/Central' ' ']
+    ['gedge' 'US/Eastern' ' ']
+    ['jt' 'NZ' ' ']
+    ['wycats' 'US/Pacific' ' ']
+    ['kubouch' 'Europe/Helsinki' ' ']
+    ['elferherrera' 'Europe/London' ' ']
+    ['storm' 'US/Pacific' ' ']
+    ]
+)
+let now = (date now)
+$m_table | update time {|row|
+    $now | date to-timezone ($row | get tz) | format date '%c'
+}
+

modules/make_readme_table.nu

@@ -0,0 +1,32 @@
+# A Script to try and create the table for the readme.md file
+# | Category         | File                                                                          |
+# | ---------------- | ----------------------------------------------------------------------------- |
+# | coloring         | [24bit-1.nu](./coloring\24bit-1.nu)                                           |
+# | coloring         | [color_table.nu](./coloring\color_table.nu)                                   |
+# | coloring         | [color_tables.nu](./coloring\color_tables.nu)                                 |
+# | coloring         | [gradient.nu](./coloring\gradient.nu)                                         |
+
+# Right now there is still manual manipulation in order to update the README.md
+# Hopefully, in the future someone will contribute a script to make this automatic.
+
+let nu_files = (ls **/*.nu)
+let nu_table = ($nu_files |
+    get name |
+    wrap File |
+    insert Category { |it|
+        let cat = ($it.File | path dirname)
+        if $cat == "" {
+            "not assigned yet"
+        } else {
+            $cat
+        }
+    } | where Category !~ ".git" | select Category File | sort-by Category)
+
+# Let's fix the file now
+let nu_table = ($nu_table | update File { |it|
+    let file_path = ($it.File  | into string | str replace '\' '/' --all)
+    let file_name = ($file_path | path basename)
+    $"[($file_name)](char lparen)./($file_path)(char rparen)"
+})
+
+echo $nu_table | to md --pretty