Update tests and docs re: zk new --interactive

docs/note-creation.md

@@ -14,15 +14,15 @@ This option is available when running `zk edit --interactive`, which spawns [`fz
 
 ## Create a note with initial content
 
-Initial content can be fed to the template through a standard input pipe, which will be expandable with the `{{content}}` [template variable](template-creation.md).
+Initial content can be fed to the template through standard input using `zk new --interactive`, which will be expandable with the `{{content}}` [template variable](template-creation.md).
 
 For example, to use the content of the macOS clipboard as the initial content you can run:
 
 ```sh
-$ pbpaste | zk new
+$ pbpaste | zk new --interactive
 ```
 
-Alternatively, use the `--interactive` or `-i` option with `zk new` to redirect standard input to provide initial content for your note:
+Alternatively, you can use the content of a file:
 
 ```sh
 $ zk new --interactive < file.txt

tests/cmd-new-template.tesh

@@ -3,7 +3,7 @@ $ cd new
 $ mkdir "a dir"
 
 # Test Handlebars template variables.
-$ echo "Piped content" | zk new --group handlebars --title "Note title" --date "January 2nd" --dry-run "a dir"
+$ echo "Piped content" | zk new --interactive --group handlebars --title "Note title" --date "January 2nd" --dry-run "a dir"
 >id: {{match "[a-z0-9]{4}"}}
 >title: Note title
 >content: Piped content

tests/cmd-new.tesh

@@ -104,15 +104,15 @@ $ zk new -n --title "Dry run"
 2>{{working-dir}}/dry-run.md
 
 # Pipe content in a new note.
-$ echo "Content of the note" | EDITOR=cat zk new --title "Piped note"
+$ echo "Content of the note" | EDITOR=cat zk new --interactive --title "Piped note"
 ># Piped note
 >
 >Content of the note
 >
 
 # Redirect file to standard input when creating a new note.
 $ echo "Content of the note" > input
-$ EDITOR=cat zk new --title "Note from redirected input" < input
+$ EDITOR=cat zk new --interactive --title "Note from redirected input" < input
 ># Note from redirected input
 >
 >Content of the note

tests/config-note-filename.tesh

@@ -17,7 +17,7 @@ $ zk new --title "A new note" --date "January 5th" --dry-run
 # Test the filename Handlebars variables.
 $ mkdir "a dir"
 $ echo "[note]\n filename = '\{{title}},\{{content}},\{{date now \"%m-%d\"}},\{{json extra}}'" > .zk/config.toml
-$ echo "Piped content" | zk new --title "A new note" --date "January 5th" --extra key=value --dry-run
+$ echo "Piped content" | zk new --interactive --title "A new note" --date "January 5th" --extra key=value --dry-run
 2>{{working-dir}}/A new note,Piped content
 2>,01-05,{"key":"value"}.md
 $ echo "[note]\n filename = '\{{id}},\{{dir}},\{{json extra}},\{{env.ZK_NOTEBOOK_DIR}}'" > .zk/config.toml