Make possible to install web ui without venv with --novenv flag

When passing `--novenv` flag to webui.sh it can skip venv.
Might be useful for installing in Docker since messing with venv in Docker might be a bit complicated.

Example usage:
`webui.sh --novenv`

Hope this gets approved and pushed into future versions of Web UI

webui.sh

@@ -4,6 +4,11 @@
 # change the variables in webui-user.sh instead #
 #################################################
 
+usevenv=1
+if [[ $@ == *"--novenv"* ]]; then
+  usevenv=0
+fi
+
 # If run from macOS, load defaults from webui-macos-env.sh
 if [[ "$OSTYPE" == "darwin"* ]]; then
     if [[ -f webui-macos-env.sh ]]
@@ -45,7 +50,7 @@ then
 fi
 
 # python3 venv without trailing slash (defaults to ${install_dir}/${clone_dir}/venv)
-if [[ -z "${venv_dir}" ]]
+if [[ -z "${venv_dir}" ]] && [[ $usevenv -eq 1 ]]
 then
     venv_dir="venv"
 fi
@@ -158,7 +163,7 @@ do
     fi
 done
 
-if ! "${python_cmd}" -c "import venv" &>/dev/null
+if [[ $usevenv -eq 1 ]] && ! "${python_cmd}" -c "import venv" &>/dev/null
 then
     printf "\n%s\n" "${delimiter}"
     printf "\e[1m\e[31mERROR: python3-venv is not installed, aborting...\e[0m"
@@ -178,7 +183,7 @@ else
     cd "${clone_dir}"/ || { printf "\e[1m\e[31mERROR: Can't cd to %s/%s/, aborting...\e[0m" "${install_dir}" "${clone_dir}"; exit 1; }
 fi
 
-if [[ -z "${VIRTUAL_ENV}" ]];
+if [[ $usevenv -eq 1 ]] && [[ -z "${VIRTUAL_ENV}" ]];
 then
     printf "\n%s\n" "${delimiter}"
     printf "Create and activate python venv"
@@ -201,7 +206,7 @@ then
     fi
 else
     printf "\n%s\n" "${delimiter}"
-    printf "python venv already activate: ${VIRTUAL_ENV}"
+    printf "python venv already activate or run without venv: ${VIRTUAL_ENV}"
     printf "\n%s\n" "${delimiter}"
 fi