Update ex_doc generation

Author: NelsonVides

docs.config

@@ -22,16 +22,7 @@
    ]},
   {prod, [
    {erl_opts, [inline_list_funcs, deterministic]}
-   ]},
-  {docs, [
-    {edoc_opts, [
-      {private, true},
-      {preprocess, true},
-      {doclet, edoc_doclet_chunks},
-      {layout, edoc_layout_chunks},
-      {dir, "_build/default/lib/segmented_cache/doc"}
-    ]}
-  ]}
+   ]}
 ]}.
 
 %% take out warnings for unused exported functions
@@ -42,3 +33,12 @@
   deprecated_function_calls,
   deprecated_functions
 ]}.
+
+{hex, [
+    {doc, #{provider => ex_doc}}
+]}.
+{ex_doc, [
+     {source_url, <<"https://github.com/esl/segmented_cache">>},
+     {extras, [<<"README.md">>, <<"LICENSE">>]},
+     {main, <<"readme">>}
+]}.