[DOC] Add resources to RTD site

[tsalo]

Closes #81.

Changes proposed in this pull request:

• Change "Introduction" page to "tedana's approach"
• Add "Multi-echo fMRI" page with sections for the physics of multi-echo fMRI, reasons to use it, and resources (including the Kundu lecture)
  • We can also add the table brought up in Add acquisition documentation #83 to this page

[codecov]

Codecov Report

Merging #99 into master will not change coverage.
The diff coverage is n/a.

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  Misses        868      868

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[emdupre]

😍 beautiful ! Since you were also going to add some materials, @dowdlelt, it'd be great to get your review, here !

[emdupre]

Is this rendering correctly ? it looks commented out on GitHub, but I'm not sure why.

[emdupre]

Confirmed with @tsalo that it renders ok.

[dowdlelt]

I think this all looks good, though I'm entirely new to all of this. Fantastic learning experience!
I'm still lagging behind on the multiecho data table - particularly creating it in a better format, suitable for adding to docs. Perhaps this week I can make some time.

In any case, this looks like the start of something fantastic.

[emdupre]

LGTM, then ! Merging, thanks ! 🎉