chore: tidy up repo

.editorconfig

@@ -1,12 +0,0 @@
-# http://editorconfig.org
-root = true
-
-[*]
-charset = utf-8
-indent_style = space
-indent_size = 2
-end_of_line = lf
-insert_final_newline = false
-trim_trailing_whitespace = true
-
-

make_singlefile.sh

@@ -1,29 +0,0 @@
-#!/usr/bin/env bash
-
-# Concatenate all macros into a single file
-
-OUTFILE='./macrocore.sas'
-
-cat > $OUTFILE <<'EOL'
-/**
-  @file
-  @brief Auto-generated file
-  @details
-    This file contains all the macros in a single file - which means it can be
-    'included' in SAS with just 2 lines of code:
-
-      filename mc url
-        "https://raw.githubusercontent.com/sasjs/core/main/macrocore.sas";
-      %inc mc;
-
-    The `build.sh` file in the https://github.com/sasjs/core repo
-    is used to create this file.
-
-  @author Allan Bowe
-**/
-EOL
-
-cat base/* >> $OUTFILE
-cat meta/* >> $OUTFILE
-cat metax/* >> $OUTFILE
-cat viya/* >> $OUTFILE