Rid of apollo-link-persisted-queries

I have a Nuxt.js project with unresolvable depenencies because of https://github.com/apollographql/apollo-link-persisted-queries:
Some of libraries allow only `^15.0.0` graphql version. Don't know, why they are not shown, otherwise I wouldn't have an error.

```
npm WARN ERESOLVE overriding peer dependency
npm WARN Found: graphql@15.5.0
npm WARN node_modules/graphql
npm WARN peer graphql@"^0.11.0 || ^0.12.0 || ^0.13.0 || ^14.0.0 || ^15.0.0" from apollo-cache-inmemory@1.6.6
npm WARN node_modules/apollo-cache-inmemory
npm WARN apollo-cache-inmemory@"*" from the root project
npm WARN 2 more (@nuxtjs/apollo, vue-cli-plugin-apollo)
npm WARN 14 more (apollo-client, apollo-link, apollo-link-batch-http, ...)
npm WARN
npm WARN Could not resolve dependency:
npm WARN peer graphql@"^0.11.0 || ^0.12.0 || ^0.13.0 || ^14.0.0" from apollo-link-persisted-queries@0.2.2
npm WARN node_modules/apollo-link-persisted-queries
npm WARN apollo-link-persisted-queries@"^0.2.2" from vue-cli-plugin-apollo@0.22.2
npm WARN node_modules/vue-cli-plugin-apollo
```

As said in repository, usage of this library is deprecated:

> NOTE: This project has been merged into the @apollo/client core, which means it is now being maintained in the https://github.com/apollographql/apollo-client repo. Refer to the updated docs for usage instructions.

Please consider refactoring.