Adjust initial_header_level for TOC

[sjbronner]

The initial_header_level, set to 2, causes 2 problems:

1. When including a TOC, it will have an empty first level, which just looks really bad.
2. It differs from the way headings are handled in MarkDown.

[smokenasty4u]

What's the issue

[sjbronner]

The issue is not apparent on github because the generation of a table of contents is not available for restructuredText there. The issue appeared in my company's blog on pages written in restructuredText and looks something like this (table of contents):

• • First Section Title
  • Second Section Title
    • Subsection Title
    • Another Subsection Title
  • Third Section Title

It should look like this, and this is what results from my pull request:

• First Section Title
• Second Section Title
  • Subsection Title
  • Another Subsection Title
• Third Section Title

[panderson02]

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[3572]

NToyKala