docs(themes): add page for `lektor dev new-theme` subcommand

content/docs/cli/dev/new-theme/contents.lr

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+comment: This file is auto generated by dump-cli-help.py
+---
+title: new-theme
+---
+summary: Creates a new theme
+---
+type: cmdlet
+---
+body:
+
+`lektor dev new-theme [THEME_NAME]`
+
+This command creates a new theme.
+
+This will present you with a very short wizard that guides you through
+creation of a new theme.  At the end of it, it will create a basic theme
+in a new subdirectory or in whatever other path you specify.
+
+This is the fastest way to creating a new theme.
+
+## Options
+
+- `--path PATH`: The destination path
+- `--help`: print this help page.