Enable bold & italic using terminfo database

Extend the default `xterm-256color` terminfo to enable italic and bold
text in `xterm`, `screem`, and `tmux`.

.conduit.yaml

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+---
+- command:
+    - tic xterm-256color.terminfo
+    - tic screen-256color.terminfo
+    - tic tmux-256color.terminfo

README.md

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+# Terminal Configuration
+
+## terminfo
+
+Enable italic and bold text in `xterm-256color`, `screen-256color`, and
+`tmux-256color` using user [terminfo][terminfo] database compiler [tic][tic].
+
+* `sitm` enter italics mode, set to `\E[3m` which enables italics
+* `ritm` exit italics mode, set to `\E[23m` which disables italics
+* `smso` enter standout mode, set to `\E[7m` which enables bold
+* `rmso` exit standout mode, set to `\E[27m` which disabled bold
+
+To compile a [terminfo][terminfo] database for the current user, output
+`~/.terminfo` use the following command.
+
+```
+$ tic xterm-256color.terminfo
+```
+
+[terminfo]: https://linux.die.net/man/5/terminfo
+[tic]: https://linux.die.net/man/1/tic

screen-256color.terminfo

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+# A screen-256color based TERMINFO that adds the escape sequences for italic.
+screen-256color|screen with 256 colors and italic,
+  sitm=\E[3m, ritm=\E[23m,
+  smso=\E[7m, rmso=\E[27m,
+  use=xterm-256color,

tmux-256color.terminfo

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+# A screen-256color based TERMINFO that adds the escape sequences for italic.
+screen-256color|screen with 256 colors and italic,
+  sitm=\E[3m, ritm=\E[23m,
+  smso=\E[7m, rmso=\E[27m,
+  use=xterm-256color,

xterm-256color.terminfo

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+# A xterm-256color based TERMINFO that adds the escape sequences for italic.
+xterm-256color|xterm with 256 colors and italic,
+  sitm=\E[3m, ritm=\E[23m,
+  smso=\E[7m, rmso=\E[27m,
+  use=xterm-256color,