Suggestion: Default ToC Header/Title

[J-Siu]

Can we have a configurable default ToC header?

For example, if we configure "Table Of Content":

<!-- TOC -->
Table Of Content

- [Build](#build)
- [Usage](#usage)
  - [Host Directories and Volume Mapping](#host-directories-and-volume-mapping)
  - [Run](#run)
  - [Compose](#compose)
- [Repository](#repository)
- [Contributors](#contributors)
- [Change Log](#change-log)
- [License](#license)

<!-- /TOC -->