Use official docs URL in description

[jeroen]

We are now automatically building pkgdown docs for all packages. If you'd like you can use this as the official homepage of the package. But if you prefer a copy on your own domain, that's fine too.

[codecov-io]

Codecov Report

Merging #75 into master will decrease coverage by 0.07%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #75      +/-   ##
==========================================
- Coverage   98.12%   98.04%   -0.08%     
==========================================
  Files          12       12              
  Lines         426      410      -16     
==========================================
- Hits          418      402      -16     
  Misses          8        8

Impacted Files	Coverage Δ
R/utils.R	92.85% <0%> (-0.9%)	:arrow_down:
R/character-shingles-tokenizers.R	90% <0%> (-0.48%)	:arrow_down:
R/ngram-tokenizers.R	95.34% <0%> (-0.21%)	:arrow_down:
R/tokenize_tweets.R	97.5% <0%> (-0.12%)	:arrow_down:
src/skip_ngrams.cpp	97.56% <0%> (-0.06%)	:arrow_down:
R/chunk-text.R	100% <0%> (ø)	:arrow_up:
src/shingle_ngrams.cpp	100% <0%> (ø)	:arrow_up:
R/ptb-tokenizer.R	100% <0%> (ø)	:arrow_up:
R/wordcount.R	100% <0%> (ø)	:arrow_up:

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[lmullen]

Thanks, @jeroen. Now that we've got official rOpenSci pkgdown docs, happy to use those instead.