Fixed typo in tips-and-tricks page.
Updated description for meging/splitting windows on tips-and-tricks page.
Added `Project switching` section to tips-and-tricks page.
Added documentation for Lua 5.3 debugging.
Added function outline to the FAQ.
Added Lua 5.3 debugging to the FAQ.
Updated internal links to strip `.html` from them.
Updated intra-page references to use `-` instead of `_`.
Added documentation for general Lua debugging.