[BUG] Mermaid not rendering if using theme

[Zombiefleischer]

Digital Garden is not rendering the mermaid diagram, if the theme is set

Example: %%{init:{'theme':'dark'}}%%

This is my mermaid code and it gets rendered as a white frame with all the code in it

---
title: Client is cluster-aware
---
%%{init:{'theme':'dark'}}%%

flowchart TD
    subgraph Shard3 [Shard 3]
        Master3[Master] --> Replica3[Replica]
    end
    subgraph Shard1 [Shard 1]
        Master1[Master] --> Replica1[Replica]
    end
    subgraph Shard2 [Shard 2]
        Master2[Master] --> Replica2[Replica]
    end

    Client -- Read and Write --> Master1 & Master2 & Master3

---
title: Client is cluster-aware
---
%%{init:{'theme':'dark'}}%%

flowchart TD
    subgraph Shard3 [Shard 3]
        Master3[Master] --> Replica3[Replica]
    end
    subgraph Shard1 [Shard 1]
        Master1[Master] --> Replica1[Replica]
    end
    subgraph Shard2 [Shard 2]
        Master2[Master] --> Replica2[Replica]
    end

    Client -- Read and Write --> Master1 & Master2 & Master3