Fix scheme-less and malformed links in migrated content (#26)

## Summary
- Add missing `https://` scheme to bare `twitter.com/jeffhicks` links in
two articles
- Fix malformed single-slash `http:/gplus.to/JeffHicks` →
`http://gplus.to/JeffHicks` in two articles
- Fix missing space before blog URL (`bloghttp://` → `blog http://`)
- Verified no remaining scheme-less or malformed links exist across all
content

Closes #22

## Test plan
- [ ] Confirm the links in
`2013-04-22-meet-the-scripting-games-judges-jeffery-hicks.md` render as
clickable external URLs
- [ ] Confirm the reference links in
`2013-02-16-phillyposh-02072013-meeting-summary-and-presentation-materials.md`
resolve correctly
- [ ] Run the grep sweep from the issue to verify no remaining
scheme-less links

🤖 Generated with [Claude Code](https://claude.com/claude-code)

https://claude.ai/code/session_01T4sVD8at6hQ7a9UTtwcUaR

---
_Generated by [Claude
Code](https://claude.ai/code/session_01T4sVD8at6hQ7a9UTtwcUaR)_

Co-authored-by: Claude <noreply@anthropic.com>

Author: HeyItsGilbert

content/articles/2013-02-16-phillyposh-02072013-meeting-summary-and-presentation-materials.md

@@ -18,7 +18,7 @@ We would also like to thank [Interfacett][8] and [Powershell.org][9] for providi
  [3]: https://powershell.org/wp-content/uploads/2013/02/PhillyPosh_2013-02-07_Presentations.zip
  [4]: http://www.youtube.com/channel/UCAc_ow5FIJtRpvew__9Iqzg?feature=watch
  [5]: http://jdhitsolutions.com/blog/
- [6]: twitter.com/jeffhicks
- [7]: http:/gplus.to/JeffHicks
+ [6]: https://twitter.com/jeffhicks
+ [7]: http://gplus.to/JeffHicks
  [8]: http://www.interfacett.com/
  [9]: https://powershell.org/

content/articles/2013-04-22-meet-the-scripting-games-judges-jeffery-hicks.md

@@ -26,6 +26,6 @@ understanding of the PowerShell paradigm.Advanced scripts should go
 beyond and demonstrate mastery of complex techniques and concepts. The  
 best of the best will have a pure, elegant, zen-like simplicity even for  
 the most challenging tasks.  
-You can keep up with Jeff at his bloghttp://jdhitsolutions.com/blog , on  
-Twitter at twitter.com/jeffhicks and on  
-Google Plus (http:/gplus.to/JeffHicks)
+You can keep up with Jeff at his blog http://jdhitsolutions.com/blog , on  
+Twitter at https://twitter.com/jeffhicks and on  
+Google Plus (http://gplus.to/JeffHicks)