Make portfolio fully data-driven via data.toml

- Added hero, experience_heading, footer, resume sections to data.toml
- Rewrote SelectedWorks.tsx with 3 dynamic card layouts (HeroCard, IconCard, TerminalCard)
- Updated Hero, Footer, Experience, ContactSection to pull from data.toml
- Fixed stray 'z' syntax error in ContactSection.tsx
- Set resume_pdf_url to Google Docs Viewer for cross-origin PDF embedding

src/data.toml

@@ -1,5 +1,5 @@
 [config]
-resume_pdf_url = ""
+resume_pdf_url = "https://docs.google.com/viewer?url=https://git.cyber.ayyalasomayajula.net/marsultor/resume-cv/raw/branch/master/resume.pdf&embedded=true"
 
 [[experiences]]
 id = "exp-1"
@@ -84,7 +84,7 @@ skills = [
 [[contact_links]]
 label = "Resume"
 value = "View & Print Resume"
-url = "https://git.cyber.ayyalasomayajula.net/marsultor/resume-cv/raw/branch/master/resume.pdf"
+url = "action:resume"
 cmd = "cat resume.md"
 icon = "file"