Convert example to exemplar

* Rename example files to exemplar

See exercism/docs#23

* [Docs] Correct .meta/example references to .meta/exemplar

* [Docs] Use exemplar instead of example

* [Docs] Update example name in file listings

* [Julia] Convert to exemplar.jl

* [elm] Rename .meta/Cook.elm to .meta/Examplar.elm

* [elm] Rename .meta/Examplar.elm .meta/Exemplar.elm

Co-authored-by: Matthieu Pizenberg <[email protected]>

reference/implementing-a-concept-exercise.md

@@ -45,7 +45,7 @@ languages
                 ├── .gitignore
                 ├── .eslintrc
                 ├── jest.config.js
-                ├── example.ts
+                ├── exemplar.ts
                 ├── <slug>.ts
                 ├── <slug>.spec.ts
                 ├── package.json
@@ -86,7 +86,7 @@ Now create the following three files:
 
 - `<slug>.cs`. the stub implementation file, which is the starting point for students to work on the exercise.
 - `<slug>.spec.js`: the test suite.
-- `example.js`: an example implementation that passes all the tests.
+- `exemplar.js`: an exemplar implementation that passes all the tests.
 
 ## Step 2: Add documentation files