New Resume view and other major updates

Changes

• Updated views: Portfolio (homepage) and Resume
• Updated data structure - User and Site data file to use can be updated easily through variables
• Markdown-PDF transformation support using md-to-pdf (new dependency)
• Post-build view to PDF support using Puppeteer (new dependency) - currently used for the Resume view
• Updated styles to cater for generic/specific views
• Refactored icons as logos and added new icons
• Updated links to open in new tabs
• Made base template more extensible and reusable
• New and updated macros to cater for updated views
• Added env variable support using dotenv
• Added custom filters such as smartTitle to replace usage of the default title filter

Included MRs

• !3 (merged)
• !4 (merged)