Fix broken links [nextstrain/docs.nextstrain.org#14]

* Link to "community page on site" rather than "community section on
  front page"
* Update colorbrewer link to HTTPS
* Update link to Zika reference GenBank file to current location in
  repo

docs/examples/examples.rst

@@ -45,4 +45,4 @@ Nextstrain community
 ====================
 
 Nextstrain also provides access to analyses by independent groups `stored and accessed via public GitHub repos <https://nextstrain.org/docs/contributing/community-builds>`__, all of which currently use augur.
-For the most up-to-date listing of these please see the `community section on the nextstrain front page. <https://nextstrain.org/#community>`__
+For the most up-to-date listing of these please see the `community section on the nextstrain site. <https://nextstrain.org/community>`__

docs/faq/colors.md

@@ -20,7 +20,7 @@ country	american samoa	#3F50CC
 country	fiji	#3F5ED0
 ```
 
-The hexadecimal notation starts with a #, followed by two letters coding for red, green, blue values. If you need advice or inspiration for colors, have a look at [colorbrewer](http://colorbrewer2.org/#type=sequential&scheme=BuGn&n=3).
+The hexadecimal notation starts with a #, followed by two letters coding for red, green, blue values. If you need advice or inspiration for colors, have a look at [colorbrewer](https://colorbrewer2.org/#type=sequential&scheme=BuGn&n=3).
 Pay particular not to mix tabs and spaces for column separation.
 The line
 ```

docs/faq/translate_ref.md

@@ -30,7 +30,7 @@ Augur will only translate genes which have 'CDS' as the feature name, and have a
                      /gene="ENV"
 ```
 
-Compare the [original Zika reference on Genbank](https://www.ncbi.nlm.nih.gov/nuccore/KX369547) to the [one used on Nextstrain](https://github.com/nextstrain/zika/blob/master/config/zika_reference.gb). Notice that the genes are designated by `CDS` instead of `mat_peptide` and have an entry for `/gene=` as well as `/product=`.
+Compare the [original Zika reference on Genbank](https://www.ncbi.nlm.nih.gov/nuccore/KX369547) to the [one used on Nextstrain](https://github.com/nextstrain/zika/blob/main/phylogenetic/defaults/zika_reference.gb). Notice that the genes are designated by `CDS` instead of `mat_peptide` and have an entry for `/gene=` as well as `/product=`.
 
 ### VCF