Update breadcrumbs.html to fix the 404 error of "Edit on github"
<li class="wy-breadcrumbs-aside">
{%- block repo %}
{% if page and page.edit_url %}
- <a href="{{ page.edit_url }}"
+ <a href="https://github.com/keras-team/keras/tree/master/docs"
{%- if config.repo_name|lower == 'github' %}
class="icon icon-github"
{%- elif config.repo_name|lower == 'bitbucket' %}
