fix: revert publish with "main" using ipjs@3 (#65)

Ref: #64 (comment)

Removing `npx` from the workflow while I'm at it. This can be added back in if
anyone objects but I'm not a big fan of `npx` for common-path scripts.

package.json

@@ -6,12 +6,12 @@
   "type": "module",
   "scripts": {
     "build": "npm run build:js && npm run build:types",
-    "build:js": "npm_config_yes=true npx ipjs@latest build --tests",
+    "build:js": "npm_config_yes=true ipjs build --tests",
     "build:types": "tsc --emitDeclarationOnly --declarationDir dist/types",
     "build:vendor": "npm run build:vendor:varint && npm run build:vendor:base-x",
     "build:vendor:varint": "npx brrp -x varint > vendor/varint.js",
     "build:vendor:base-x": "npx brrp -x @multiformats/base-x > vendor/base-x.js",
-    "publish": "npm_config_yes=true npx ipjs@latest publish",
+    "publish": "npm_config_yes=true ipjs publish",
     "lint": "standard",
     "check": "tsc --noEmit --noErrorTruncation",
     "test:cjs": "npm run build:js && mocha dist/cjs/node-test/test-*.js && npm run test:cjs:browser",
@@ -89,6 +89,7 @@
     "@typescript-eslint/parser": "^4.6.0",
     "c8": "^7.3.5",
     "hundreds": "0.0.9",
+    "ipjs": "^3.4.4",
     "mocha": "^8.2.0",
     "polendina": "^1.1.0",
     "standard": "^15.0.0",
@@ -123,4 +124,4 @@
       ]
     }
   }
-}
+}