Add .Lastmod support

[jamesericdavidson]

Adding enableGitInfo = true to config.toml allows the last modified date of the post to be shown.

Example:

Revert 46d31ac93b4ad3b8d26e2c4556e3d77cc41ba8ec if you don't want this functionality in exampleSite.

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[jamesericdavidson]

Documentation for posterity:

• How to Add a Last Modified Date in Hugo Articles
• Page Variables
• Git Info Variables
• .Format

[526avijitgupta]

@jamesericdavidson Thanks for the pull request. Unfortunately, adding another date in the post does not fit with our design goals.