[MRG+1] Add sphinx_rtd_theme to docs setup readme

[harshasrinivas]

Concerns Sphinx 1.4 release #1893 . sphinx_rtd_theme has to be installed manually.

[redapple]

What about adding a requirements.txt to scrapy/docs/ and referencing if in tox.ini's [docs]?

[harshasrinivas]

@redapple Yes, I too thought of the same. :)
But since there are just 2 requirements for building the docs, do you think adding a requirements.txt would be beneficial?

[redapple]

I think it would still be easier to pip install -r docs/requirements.txt

[harshasrinivas]

Sure @redapple , adding right away.

[codecov-io]

Codecov Report

Merging #2668 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2668   +/-   ##
=======================================
  Coverage   84.66%   84.66%           
=======================================
  Files         162      162           
  Lines        9122     9122           
  Branches     1353     1353           
=======================================
  Hits         7723     7723           
  Misses       1141     1141           
  Partials      258      258

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ec55799...83aa0c5. Read the comment docs.

[redapple]

I'm not sure that it's clear that you would run this inside scrapy/docs/

[harshasrinivas]

Just like the Compile the documentation part of this README, to maintain uniformity shall I mention "run the following command from this dir"?

[redapple]

That would not hurt indeed.

[redapple]

Looks good to me.