Zoekt search should implement the repo: option

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Proposal

Zoekt code search currently does not allow to search for repositories.

Previously it was possible to search with something like path:*-ops/config/* finding all projects ending with -ops with a config folder, this is currently not posisble.

The suggestion is to implement the r: / repo: option available in Zoekt - https://github.com/sourcegraph/zoekt/blob/main/web/templates.go#L173

Context

• https://github.com/sourcegraph/zoekt/blob/main/cmd/zoekt-git-index/main.go#L115
• https://github.com/sourcegraph/zoekt/pull/521/files