.config/fontconfig/fonts.conf: Fix font rendering.

Enable:
* BCI hinting.
* antialiasing
* LCD filtering
.zshrc: LinuxGitMsg: Function to search Linus' repo's commit messages.
.muttrc: Reverse sort between threads by most recent message therein.

* Lessens chances of missing a message in a very old thread.
* Increases incentive to delete or archive messages.
.zshrc: t: Roland's alias for incessant use of cat.
.zshrc: ClearClipboard: Clean up xclip processes.
.zshrc: StableQueue: Open Linux kernel stable queue in a browser.
.zshrc: Move portable options out of per-shell case, and vice-versa.
.zshrc: readline Ctrl-R (incremental history search) emulation in Vi insert mode.