Add script to copy apidocs and xref to netty-website

Motivation:

After the release was done we need to also copy the apidocs and xref to the netty-website

Modifications:

Add script that does the copy etc

Result:

Less manual steps to remember

scripts/copy_javadocs.sh

@@ -0,0 +1,37 @@
+#!/bin/bash
+set -e
+
+if [ "$#" -ne 1 ]; then
+    echo "Expected netty-website directory"
+    exit 1
+fi
+
+if [ ! -d "$1" ]; then
+    echo "$1 is not a directory"
+    exit 1
+fi
+
+
+BRANCH=$(git branch --show-current)
+WEBSITE_API_DIR="$1"/"$BRANCH"/api/
+WEBSITE_XREF_DIR="$1"/"$BRANCH"/xref/
+API_DIR=all/target/api/
+XREF_DIR=all/target/xref/
+
+if [ ! -d "$API_DIR" ]; then
+    echo "$API_DIR not exists, didn't run the release process yet?"
+    exit 1
+fi
+
+if [ ! -d "$XREF_DIR" ]; then
+    echo "$XREF_DIR not exists, didn't run the release process yet?"
+    exit 1
+fi
+
+echo "Delete old javadocs and xref files"
+rm -rf "$WEBSITE_API_DIR"/*
+rm -rf "$WEBSITE_XREF_DIR"/*
+
+echo "Copy javadocs and xref files"
+cp -r "$API_DIR"/* "$WEBSITE_API_DIR"
+cp -r "$XREF_DIR"/* "$WEBSITE_XREF_DIR"