Chore: Pragmatically add customized bootstrap.css instead of generating it during build

Lock bootstrap version to `3.4.1`

Related to #115

package.json

@@ -14,7 +14,7 @@
     "build:replace-css": "npx --yes replace 'min-width: 768px' 'min-width: 620px' build/help/bootstrap.min.css && npx --yes replace 'max-width: 767px' 'max-width: 619px' build/help/bootstrap.min.css"
   },
   "dependencies": {
-    "bootstrap": "^3.4.1",
+    "bootstrap": "3.4.1",
     "jquery": "^3.2.1"
   },
   "optionalDependencies": {

pnpm-lock.yaml

@@ -20,7 +20,7 @@ importers:
   .:
     dependencies:
       bootstrap:
-        specifier: ^3.4.1
+        specifier: 3.4.1
         version: 3.4.1
       jquery:
         specifier: ^3.2.1