This reverts commit 0a4efe972a78378eba5c5fbc6819c39b3cc6c9cb.

This reverts commit ea8ec855c3c6870d29c55afe3787afb2c05026a1.

* shell() already provides a temporary script. Not jumping into another sub-shell should preserve help preserve the top-level environment.

* Removes dead code after execl()
* Return the return value of execl() immediately
* Output redirection fix: if f_stderr and redirect_stderr were both set, stderr was not redirected
* Move the file handles into the child process
* Bash now executes with --norc to avoid clobbering environment variables. This mimics /bin/sh behavior.

* Fix pandoc command regression

* Add space between destination and input

* Add pandoc dependency

* Dump output of indexed files

* Clean package caches (saves about 1GB of layer-space)

* Update installation instructions

* Update layout
* Use template variables where appropriate
* Instructions now provide release notes in one place

* Pandoc now uses --standalone