[mod] proxy nginx config is now generated based on domains.env

- domains and servers in domains.env are mapped 1:1
 - moved domains.env to ./files/domains.env
 - renamed kweb to web for a more generic approach

web/Dockerfile

@@ -0,0 +1,21 @@
+FROM nginx:1.17.9-alpine
+
+ARG USER_UUID=12000
+ARG USER_GUID=12000
+ARG GROUP_NAME=proxy
+ARG USER_NAME=proxy
+
+RUN set -eux; \
+    addgroup -g $USER_GUID $GROUP_NAME; \
+    adduser -u $USER_UUID -G $GROUP_NAME -s /sbin/nologin -D $USER_NAME;
+
+# create temp dir for service
+RUN mkdir -p /service/temp \
+ && chown -R $USER_NAME:$GROUP_NAME /service/temp
+
+# copy configuration and entrypoint.sh
+COPY ./files/nginx.conf /etc/nginx/nginx.conf
+
+COPY ./files/index.html /service/html/index.html
+
+USER $USER_NAME