chore: remove fruitdown references

Author: AlbaHerrerias

docs/custom.md

@@ -245,23 +245,6 @@ const db = new PouchDB('mydb', {adapter: 'localstorage'});
 console.log(db.adapter); // 'localstorage'
 ```
 
-### [pouchdb-adapter-fruitdown](https://npmjs.org/package/pouchdb-adapter-fruitdown)
-
-An optional adapter that works in the browser using IndexedDB via [fruitdown](https://github.com/nolanlawson/fruitdown). The adapter name
-is `'fruitdown'`.
-
-#### Example usage
-
-```bash
-npm install pouchdb-adapter-fruitdown
-```
-
-```js
-PouchDB.plugin(require('pouchdb-adapter-fruitdown'));
-const db = new PouchDB('mydb', {adapter: 'fruitdown'});
-console.log(db.adapter); // 'fruitdown'
-```
-
 ### [pouchdb-adapter-node-websql](https://npmjs.org/package/pouchdb-adapter-node-websql)
 
 An optional adapter that works in Node.js using SQLite via [node-websql](https://github.com/nolanlawson/node-websql). The adapter name

docs/static/img/pouchdb_adapters.png

@@ -24,8 +24,7 @@ PouchDB's API to access them.
 
 Only certain adapters (e.g. in-memory, based on [MemDOWN](http://github.com/level/memdown)) are officially supported by the
 PouchDB project; you are free to experiment with other datastores, but be forewarned of the above caveats. To see how to
-build a custom LevelDOWN-based database, see the source code for `pouchdb-adapter-memory`, `pouchdb-adapter-localstorage`, or
-`pouchdb-adapter-fruitdown`.
+build a custom LevelDOWN-based database, see the source code for `pouchdb-adapter-memory` or `pouchdb-adapter-localstorage`.
 
 ### Details