New resume view

Changes

• Add puppeteer as dependency
• Updated base template to make it more reusable
• Explicitly set Nunjucks as markdownTemplateEngine (instead of default Liquid)
• Rename old resume template (may be deprecated)
• Added new styles currently specific for the new resume view
• Added new macros for the new resume view
• Added new base and header layouts for the new resume view
• Added new resume view
• Use Puppeteer to generate a pdf out of the new resume view
• Added dotenv support for adding env variables through .env file
• Old sitedata.json data file has been renamed to site.json
• Added new user.json data file for user/person of interest related data
• Added new data.js module for enabling referring to data files based on variables instead of hardcoding their file names i.e. in templates
• Added env variables SITE_DATA and USER_DATA for specifying the name of the site and user data file respectively
• Updated templates to read data using these variables instead of hardcoded (data) file names
• Add source json files to Eleventy's watch list
• Designated data/.private dir as the place to put data files which will remain local