Title/subtitle are not shown

[TristanPeers]

Hi - great utility, thanks for creating it.

Sadly when I try it the title and subtitle are not showing in the slide.

I used your test yaml and the out of the box config.

test.yaml:

title: The potential scale of tokenization adoption hinges on multiple factors.
subtitle: Forecasts of three potential adoption scenarios, 2030, nonexhaustive

table:
  rows: 6
  cols: 4
  has_col_header: true
  has_row_header: true
  col_headers: ["Slower adoption", "Base scenario", "Accelerated adoption"]
  col_header_color: accent1
  column_widths: [0, 1, 1, 1] # custom weights (remove for html-4 style default)

  row_headers:
    - - { text: "Potential 2030 tokenized market cap" }
      - { text: "US$ trillion", color: tx1, bold: false }
    - "Regulation"
    - "Infrastructure and enablers"
    - "Market demand"
    - "Risk and reputation"

  row_overrides:
    0:
      align: ctr
      anchor: ctr
      bold: true
      color: accent1
      size: 20

  cells:
    - ["$0.8T", "$1.9T", "$3.8T"]
    - [
        "Regulatory challenges remain high",
        "Regional disparities exist, but regulatory clarity is increasing",
        "Permissive regulation",
      ]
    - [
        "Inadequate infrastructure to support tokenization, lack of enablers (eg, institutional-grade stablecoin)",
        "Infrastructure reaches adequate maturity, required enablers emerge",
        "Infrastructure and enablers reach institutional-grade maturity, available at scale",
      ]
    - [
        "No solution to cold start problem limits demand for tokenization",
        "Some assets tokenized at scale catalyzed by larger players",
        "Cold start problem is overcome by industry-wide collaboration",
      ]
    - [
        "Systemic risk event occurs and limits or discourages adoption",
        "Limited security issues or systemic risk events",
        "",
      ]

pptx generate test.yaml -o test.pptx