Replace hardcoded URLs to site in pages and templates

[bnvk]

Currently, in throughout the website Jekyll templates and pages, the website URL

http://opensourcedesign.net

Is hardcoded. We should make use of Jekyll variables, so as to make developing locally, a stagging server, etc... all work well. Thus, we should replace that value with

{{ site.url }}

Which then gets drawn from _config.yml values.

[aaqaishtyaq]

hey, @bnvk since no one is currently working/assigned to this issue, I would like take up the task.

[bnvk]

@aaqaishtyaq go for it 👍