Fix warnings in calva

Author: mk

.gitignore

@@ -1,4 +1,5 @@
 /.clerk/
+/.calva/
 /.cache/
 /.clj-kondo/
 /.cpcache/

exercises/ex_1_exploration.clj

@@ -1,6 +1,6 @@
 ;; # Exercise 1: Exploring Data with Clerk
 
-(ns explore
+(ns ex_1_exploration
   {:nextjournal.clerk/auto-expand-results? true
    :nextjournal.clerk/budget nil}
   (:require [applied-science.edn-datasets :as data]
@@ -12,6 +12,7 @@
 
 ;; Explore the metadata on those vars to get a description of what's inside them.
 
+
 ;; ## Table
 ;; Pick one dataset above that interests you and use `clerk/table` to show the dataset as a table.
 

exercises/ex_5_caching.clj

@@ -1,5 +1,5 @@
 ;; # Caching
-(ns exercises.ex-4-caching
+(ns ex-5-caching
   (:require [nextjournal.clerk :as clerk]))
 
 ;; Note how the following notebook will show the same value

exercises/ex_7_viewer_require.clj

@@ -1,7 +1,6 @@
 ;; # Viewer Require
-(ns exercises.ex-6-viewer-require
-  (:require [nextjournal.clerk :as clerk]
-            [nextjournal.clerk.viewer :as v]))
+(ns ex-7-viewer-require
+  (:require [nextjournal.clerk :as clerk]))
 
 ;; In this exercise, we'll use the Clerk's viewer api to dynamically
 ;; load a JavaScript library.
@@ -22,38 +21,3 @@
 
 (clerk/with-viewer emoji-viewer
   "Hallo :smile:")
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-^{::clerk/visibility {:code :hide :result :hide}}
-(comment
-  (fn [EmojiConverter]
-    (.replace_colons (new EmojiConverter) value)))