docs: update eclair section of build custom node images

docs/custom-nodes.md

@@ -157,10 +157,10 @@ Polar v1.0.0 supports using custom docker images for nodes in your networks. The
    # this was meant to make the image smaller, but we use multi-stage build so we don't care
    RUN apk add --no-cache curl tar bash
 
-   ARG MAVEN_VERSION=3.6.3
+   ARG MAVEN_VERSION=3.9.2
    ARG USER_HOME_DIR="/root"
-   ARG SHA=c35a1803a6e70a126e80b2b3ae33eed961f83ed74d18fcd16909b2d44d7dada3203f1ffe726c17ef8dcca2dcaa9fca676987befeadc9b9f759967a8cb77181c0
-   ARG BASE_URL=https://apache.osuosl.org/maven/maven-3/${MAVEN_VERSION}/binaries
+   ARG SHA=900bdeeeae550d2d2b3920fe0e00e41b0069f32c019d566465015bdd1b3866395cbe016e22d95d25d51d3a5e614af2c83ec9b282d73309f644859bbad08b63db
+   ARG BASE_URL=https://archive.apache.org/dist/maven/maven-3/${MAVEN_VERSION}/binaries
 
    RUN mkdir -p /usr/share/maven /usr/share/maven/ref \
      && curl -fsSL -o /tmp/apache-maven.tar.gz ${BASE_URL}/apache-maven-${MAVEN_VERSION}-bin.tar.gz \
@@ -178,10 +178,9 @@ Polar v1.0.0 supports using custom docker images for nodes in your networks. The
    WORKDIR /usr/src
    COPY pom.xml pom.xml
    COPY eclair-core/pom.xml eclair-core/pom.xml
+   COPY eclair-front/pom.xml eclair-front/pom.xml
    COPY eclair-node/pom.xml eclair-node/pom.xml
-   COPY eclair-node-gui/pom.xml eclair-node-gui/pom.xml
    COPY eclair-node/modules/assembly.xml eclair-node/modules/assembly.xml
-   COPY eclair-node-gui/modules/assembly.xml eclair-node-gui/modules/assembly.xml
    RUN mkdir -p eclair-core/src/main/scala && touch eclair-core/src/main/scala/empty.scala
    # Blank build. We only care about eclair-node, and we use install because eclair-node depends on eclair-core
    #################### Polar Modification