fix readme, template_fail.html ; update general info and url in template

readme.md

@@ -1,12 +1,18 @@
 # http-rs
 
 Simple webserver, designed to be minimal and just work.
+We now use clap for parsing the cli args, so dont try the old way!
 
 ```
-./http-rs PORT HTMLFILE
-./http-rs 8080 ./dir/ 
+./http-rs --port 8080 --root ./data/to/serve
 ```
 
+## Arguments which can be used:
+
+- `--port`    : a port where the webserver opens
+- `--root`    : the directory where the webserver serves files from
+- `--threads` : Number of threads to use (default : 2)
+
 ## Docker
 
 This can be run within a docker container. And tbh its very simple!
@@ -23,7 +29,8 @@ COPY app/ /app/     # copy your HTML containing folder to app or some dir
 
 EXPOSE 8080
 
-CMD ["http-rs", "8080", "/app"] # run the app , PORT:8080;DIR:/app
+# this does look bloated, but its clean!
+CMD ["http-rs", "--port", "8080", "--root", "/app"] # run the app , PORT:8080;DIR:/app
 ```