chore(examples): use theme package from monorepo

[dhayab]

Summary

Currently examples retrieve a version of @algolia/autocomplete-theme-classic that is not up to date, which makes yarn retrieve it from npm instead of linking it from the monorepo. This PR fixes this.

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Sandbox	Source
@algolia/autocomplete-example-github-repositories-custom-plugin	Configuration
@algolia/autocomplete-example-instantsearch	Configuration
@algolia/autocomplete-example-playground	Configuration
@algolia/autocomplete-example-preview-panel-in-modal	Configuration
@algolia/autocomplete-example-react-renderer	Configuration
@algolia/autocomplete-example-starter-algolia	Configuration
@algolia/autocomplete-example-starter	Configuration
@algolia/autocomplete-example-reshape	Configuration
@algolia/autocomplete-example-vue	Configuration

[Haroenv]

should the yarn.lock not also have been edited?

[dhayab]

should the yarn.lock not also have been edited?

@Haroenv the lockfile was not versioned correctly. A yarn install on the repo revealed this issue to me, as yarn.lock got modified after the operation.

So this change reverts the lockfile to its expected state (not referencing the theme package from npm).

[Haroenv]

@dhayab, yes, but why is there no change in yarn.lock in this commit then?

[dhayab]

@Haroenv

Because the only diff in yarn.lock was

+"@algolia/autocomplete-theme-classic@1.9.4":
+  version "1.9.4"
+  resolved "https://registry.yarnpkg.com/@algolia/autocomplete-theme-classic/-/autocomplete-theme-classic-1.9.4.tgz#6400359de17fe0c698eb65303f67cea53175bb08"
+  integrity sha512-ydeYji3VKIPRFHTnIBVbwocFs9FOKLJnQtYIqmT3z3SVhsceeju2XUD9v3jZRrKb9FVrs1oKQaw0MsessZXMkw==

If with this PR I remove all mentions of autocomplete-theme-classic@1.9.4, this reference disappears, making it equivalent to the yarn.lock currently versioned.