Fix broken internal links to retired WordPress sections (#20) - #67

Changed pages include:

• articles/2012-12-21-powershell-org-our-first-year-in-review/index.html - view
• articles/2013-01-28-the-2013-winter-scripting-camp/index.html - view
• articles/2013-02-01-winter-scripting-camp-opened-to-the-public/index.html - view
• articles/2013-04-05-coming-tips-for-the-scripting-games/index.html - view
• articles/2013-04-15-changes-coming-to-powershell-org/index.html - view
• articles/2013-04-26-forums-migration-schedule/index.html - view
• articles/2013-07-23-techsessions-free-powershell-webinars/index.html - view
• articles/2013-08-15-state-of-the-org-website-games-summit-and-more/index.html - view
• articles/2016-06-24-heres-what-youve-missed-at-powershell-org-and-whats-coming/index.html - view
• articles/2018-10-24-powershell-org-site-status-update/index.html - view

There are more changes not included in the list