fix(content): restore three blank article titles and tighten home description

Three migrated 2012-2014 posts had an empty `title:`, so they shipped with no
<title>, <h1>, og:title, or Article schema headline. Restore titles from slug
and body. Also replace the home description with keyword-rich copy under the
~155-char SERP cutoff.

Author: HeyItsGilbert

content/_index.md

@@ -1,6 +1,6 @@
 ---
 title: "Welcome Automaters!"
-description: "PowerShell.org is the community hub for PowerShell enthusiasts, automaters, and professionals."
+description: "PowerShell.org is the community hub for PowerShell pros and automators — the podcast, the annual Summit, learning resources, and active community forums."
 ---
 
 PowerShell.org serves as the central hub for the PowerShell community worldwide.

content/articles/2012-09-09-powershell-summit-im-feeling-lucky-tickets-on-sale-400-each.md

@@ -1,5 +1,5 @@
 ---
-title: 
+title: "PowerShell Summit: 'I'm Feeling Lucky' Tickets on Sale, $400 Each"
 authors:
   - Don Jones
 date: "2012-09-09T22:55:29+00:00"

content/articles/2012-10-26-powershell-v3s-new-simplified-syntax.md

@@ -1,5 +1,5 @@
 ---
-title: 
+title: "PowerShell v3's New Simplified Syntax"
 authors:
   - Don Jones
 date: "2012-10-26T18:02:31+00:00"

content/articles/2014-05-14-why-puppet-vs-dsc-isnt-even-a-thing.md

@@ -1,5 +1,5 @@
 ---
-title: 
+title: "Why Puppet vs. DSC Isn't Even a Thing"
 authors:
   - Don Jones
 date: "2014-05-14T13:06:15+00:00"