Update solr docker config

Update the docker config to remove references to the old solr folder.
Also remove the solr php package as it isn't needed (and available)
anymore.

Dockerfile

@@ -33,7 +33,7 @@ RUN set -xe \
     && cd /pecl-memcache-NON_BLOCKING_IO_php7 \
     && phpize && ./configure && make && make install \
     && cd / && rm -rf /pecl-memcache-NON_BLOCKING_IO_php7 \
-    && docker-php-ext-enable apcu memcache pcov solr \
+    && docker-php-ext-enable apcu memcache pcov \
     && apk add --no-cache --virtual .phpext-rundeps \
       gettext \
       libxslt \

docker/docker-compose.dev.yml

@@ -116,7 +116,6 @@ services:
       - composer_deps:/atom/src/vendor/composer
       - npm_deps:/atom/src/node_modules
       - ..:/atom/src:rw
-      - ../solr:/solr
     networks:
       - solr
 
@@ -144,7 +143,6 @@ services:
       - npm_deps:/atom/src/node_modules
       - ..:/atom/src:ro
       - ./etc/nginx/nginx.conf:/etc/nginx/nginx.conf:ro
-      - ../solr:/solr
     ports:
       - "63001:80"
       - "9001:81"