update countries.json (#651)

## Description:
Update countries.json, remove duplicate flags, fix flags
## Please complete the following:

- [ ] I have added screenshots for all UI updates
- [ ] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
- [ ] I understand that submitting code with bugs that could have been
caught through manual testing blocks releases and new features for all
contributors

## Please put your Discord username so you can be contacted if a bug or
regression is found:

<DISCORD USERNAME>

---------

Co-authored-by: evan <openfrontio@gmail.com>

resources/flags/Puerto_Rico.svg

@@ -1,9 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="150px" height="150px" viewBox="0 0 150 100" version="1.1">
-<g id="surface1">
-<rect x="0" y="0" width="150" height="100" style="fill:rgb(100%,100%,100%);fill-opacity:1;stroke:none;"/>
-<path style="fill-rule:nonzero;fill:rgb(100%,100%,100%);fill-opacity:1;stroke-width:120;stroke-linecap:butt;stroke-linejoin:miter;stroke:rgb(93.333334%,0%,0%);stroke-opacity:1;stroke-miterlimit:4;" d="M 0 60 L 900 60 M 900 300 L 0 300 M 0 540 L 900 540 " transform="matrix(0.166667,0,0,0.166667,0,0)"/>
-<path style=" stroke:none;fill-rule:nonzero;fill:rgb(0%,31.37255%,94.117647%);fill-opacity:1;" d="M 0 0 L 0 100 L 86.667969 50 "/>
-<path style=" stroke:none;fill-rule:nonzero;fill:rgb(100%,100%,100%);fill-opacity:1;" d="M 19 63.667969 L 28.832031 33.167969 L 38.667969 63.667969 L 12.832031 44.832031 L 44.832031 44.832031 "/>
-</g>
-</svg>

resources/flags/basque.svg

@@ -1,8 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="150px" height="150px" viewBox="0 0 150 84" version="1.1">
-<g id="surface1">
-<rect x="0" y="0" width="150" height="84" style="fill:rgb(83.529413%,16.862746%,11.764706%);fill-opacity:1;stroke:none;"/>
-<path style="fill-rule:nonzero;fill:rgb(0%,0%,0%);fill-opacity:1;stroke-width:4.3;stroke-linecap:butt;stroke-linejoin:miter;stroke:rgb(0%,60.784316%,28.235295%);stroke-opacity:1;stroke-miterlimit:4;" d="M 0 0 L 50 28 M 50 0 L 0 28 " transform="matrix(3,0,0,3,0,0)"/>
-<path style="fill-rule:nonzero;fill:rgb(0%,0%,0%);fill-opacity:1;stroke-width:4.3;stroke-linecap:butt;stroke-linejoin:miter;stroke:rgb(100%,100%,100%);stroke-opacity:1;stroke-miterlimit:4;" d="M 25 0 L 25 28 M 0 14 L 50 14 " transform="matrix(3,0,0,3,0,0)"/>
-</g>
-</svg>

resources/flags/england.svg

@@ -1,8 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="150px" height="150px" viewBox="0 0 150 150" version="1.1">
-<g id="surface1">
-<path style=" stroke:none;fill-rule:nonzero;fill:rgb(100%,100%,100%);fill-opacity:1;" d="M 0 30 L 150 30 L 150 120 L 0 120 Z M 0 30 "/>
-<path style=" stroke:none;fill-rule:nonzero;fill:rgb(80.784315%,6.666667%,14.117648%);fill-opacity:1;" d="M 66 30 L 84 30 L 84 120 L 66 120 Z M 66 30 "/>
-<path style=" stroke:none;fill-rule:nonzero;fill:rgb(80.784315%,6.666667%,14.117648%);fill-opacity:1;" d="M 0 66 L 150 66 L 150 84 L 0 84 Z M 0 66 "/>
-</g>
-</svg>

resources/flags/scotland.svg

@@ -1,7 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="150px" height="150px" viewBox="0 0 150 150" version="1.1">
-<g id="surface1">
-<path style=" stroke:none;fill-rule:nonzero;fill:rgb(0%,36.862746%,72.156864%);fill-opacity:1;" d="M 0 30 L 150 30 L 150 120 L 0 120 Z M 0 30 "/>
-<path style="fill-rule:nonzero;fill:rgb(0%,0%,0%);fill-opacity:1;stroke-width:120;stroke-linecap:butt;stroke-linejoin:miter;stroke:rgb(100%,100%,100%);stroke-opacity:1;stroke-miterlimit:4;" d="M 0 0 L 999.99996 599.999976 M 0 599.999976 L 999.99996 0 " transform="matrix(0.15,0,0,0.15,0,30)"/>
-</g>
-</svg>

src/client/data/countries.json

@@ -1674,10 +1674,6 @@
     "continent": "Africa",
     "name": "Republic of the Congo"
   },
-  {
-    "code": "cthulhu_republic",
-    "name": "Republic of Cthulhu"
-  },
   {
     "code": "Republic of Egypt",
     "continent": "Africa",