chore: remove eslint markdown plugin

Author: myandrienko

Diff for: .eslintrc.json

@@ -4,7 +4,6 @@
     "babel",
     "jest-dom",
     "jest",
-    "markdown",
     "prettier",
     "react-hooks",
     "import",
@@ -156,7 +155,6 @@
       "plugins": [
         "@typescript-eslint",
         "babel",
-        "markdown",
         "prettier",
         "react",
         "typescript-sort-keys",

Diff for: package.json

@@ -187,7 +187,6 @@
     "eslint-plugin-jest": "^24.1.3",
     "eslint-plugin-jest-dom": "^3.3.0",
     "eslint-plugin-jsx-a11y": "^6.4.1",
-    "eslint-plugin-markdown": "^3.0.0",
     "eslint-plugin-node": "^11.1.0",
     "eslint-plugin-prettier": "^3.1.4",
     "eslint-plugin-promise": "^4.2.1",