Improve svgo.yml

- Remove plugins that are already the default in svgo, and link to docs
- Move the `removeDimensions` plugin to be next to `removeViewBox`
- Add configuration to the `convertPathData` and `mergePaths` plugins
  to avoid an issue with over-aggressive optimization for arcto commands
  introduced in svgo v1.3.0.

Also:

- Add missing `--config` option to the svgo command in README
- Remove over-aggressive optimization from the cv.svg flag

README.md

@@ -41,7 +41,7 @@ First, edit the relevant SVG files in the `flags/` directory.
 Then run `svgo` to optimize the SVG files:
 
 ```sh
-svgo ./flags --recursive
+svgo ./flags --recursive --config=svgo.yml
 ```
 
 Then commit the changes, and submit them as a pull request.

svgo.yml

@@ -1,20 +1,12 @@
+# Default options: https://github.com/svg/svgo#what-it-can-do
+
 floatPrecision: 1
 multipass: true
 plugins:
-- removeTitle: true
-- removeDesc: true
-- removeUselessDefs: true
-- removeHiddenElems: true
+- removeDimensions: true
 - removeViewBox: false
-- removeUnknownsAndDefaults: true
-- removeUselessStrokeAndFill: true
-- removeUnusedNS: true
-- cleanupIDs: true
-- cleanupNumericValues: true
-- collapseGroups: true
 - removeRasterImages: true
 - sortAttrs: true
-- removeDimensions: true
 - removeAttrs:
     attrs:
     - 'font.*'
@@ -24,3 +16,10 @@ plugins:
     - 'text.*'
 - removeStyleElement: true
 - removeScriptElement: true
+# Avoid optimization that breaks some editors/viewers.
+# For context, see https://github.com/svg/svgo/issues/1137
+# and https://github.com/HatScripts/circle-flags/pull/4.
+- convertPathData:
+    noSpaceAfterFlags: false
+- mergePaths:
+    noSpaceAfterFlags: false