Update README, switch to SQLite, and adjust ESLint/perfectionist rules

- Simplified and clarified README structure and content.
- Replaced `mongooseAdapter` with `sqliteAdapter` for database configuration.
- Disabled all `perfectionist` ESLint rules for consistency.
- Updated `billingPlugin` import path in dev config.

dev/payload.config.ts

@@ -1,9 +1,8 @@
-import { mongooseAdapter } from '@payloadcms/db-mongodb'
+import { sqliteAdapter } from '@payloadcms/db-sqlite'
 import { lexicalEditor } from '@payloadcms/richtext-lexical'
-import { MongoMemoryReplSet } from 'mongodb-memory-server'
 import path from 'path'
 import { buildConfig } from 'payload'
-import { billingPlugin } from '../src/index.js'
+import { billingPlugin } from '../dist/index.js'
 import sharp from 'sharp'
 import { fileURLToPath } from 'url'
 
@@ -17,18 +16,7 @@ if (!process.env.ROOT_DIR) {
   process.env.ROOT_DIR = dirname
 }
 
-const buildConfigWithMemoryDB = async () => {
-  if (process.env.NODE_ENV === 'test') {
-    const memoryDB = await MongoMemoryReplSet.create({
-      replSet: {
-        count: 3,
-        dbName: 'payloadmemory',
-      },
-    })
-
-    process.env.DATABASE_URI = `${memoryDB.getUri()}&retryWrites=true`
-  }
-
+const buildConfigWithSQLite = () => {
   return buildConfig({
     admin: {
       importMap: {
@@ -48,9 +36,10 @@ const buildConfigWithMemoryDB = async () => {
         },
       },
     ],
-    db: mongooseAdapter({
-      ensureIndexes: true,
-      url: process.env.DATABASE_URI || '',
+    db: sqliteAdapter({
+      client: {
+        url: `file:${path.resolve(dirname, 'payload.sqlite')}`,
+      },
     }),
     editor: lexicalEditor(),
     email: testEmailAdapter,
@@ -81,4 +70,4 @@ const buildConfigWithMemoryDB = async () => {
   })
 }
 
-export default buildConfigWithMemoryDB()
+export default buildConfigWithSQLite()