build: use rebar3 ex_doc plugin

Also resolves issues with erlang/otp#6916 for
erlang 26.

rebar.config

@@ -28,26 +28,21 @@
     {"win32", "priv/ewpcap.dll", ["c_src/ewpcap.c"]}
 ]}.
 
-{post_hooks, [
-    {edoc,
-        "ex_doc --config .ex_doc.config --source-url \"https://github.com/msantos/ewpcap\" --source-ref \"master\" \"ewpcap\" `erl -noshell -s init stop -eval '{ok, [{_,_,X}]} = file:consult(\"src/ewpcap.app.src\"), io:format(\"~s\", [proplists:get_value(vsn, X, \"0.0.0\")]).'` _build/default/lib/ewpcap/ebin"}
-]}.
-
-{edoc_opts, [
-    {doclet, edoc_doclet_chunks},
-    {layout, edoc_layout_chunks},
-    {dir, "_build/default/lib/ewpcap/doc"}
-]}.
-
 {dialyzer, [
     {warnings, [
         unmatched_returns,
         error_handling,
-        race_conditions,
         underspecs
     ]}
 ]}.
 
-{project_plugins, [erlfmt]}.
+{ex_doc, [
+    {extras, [
+        {"README.md", #{title => "Overview"}},
+        "LICENSE"
+    ]},
+    {main, "README.md"},
+    {source_url, "https://github.com/msantos/ewpcap"}
+]}.
 
-{erlfmt, [write]}.
+{hex, [{doc, ex_doc}]}.