Emacs: Configure iregister package

Configure iregister package. This package is helpful in going through
registers in more convenient way.

,----[ keybindings ]
| "M-n" -> iregister-jump-to-next-marker
| "M-p" -> iregister-jump-to-previous-marker
| "M-u" -> iregister-point-or-text-to-register
| "M-l" -> iregister-text
`----

Tested-by: Ratheesh S <ratheeshreddy@gmail.com>
Signed-off-by: Ratheesh S <ratheeshreddy@gmail.com>
Emacs: Add html-mode-init.el pkg for html init

This package/module contains initialization of html/web related modules.
Currently, these include html and CSS file editing mode configurations.

Tested-by: Ratheesh S <ratheeshreddy@gmail.com>
Signed-off-by: Ratheesh S <ratheeshreddy@gmail.com>
Emacs: Enable eldoc to lisp mode

Tested-by: Ratheesh S <ratheeshreddy@gmail.com>
Signed-off-by: Ratheesh S <ratheeshreddy@gmail.com>
Emacs:rainbow-mode: Enable mode for common modes

Tested-by: Ratheesh S <ratheeshreddy@gmail.com>
Signed-off-by: Ratheesh S <ratheeshreddy@gmail.com>
Emacs:sml: remove customization in user-init.el

Source: http://steckerhalter.co.vu/steckemacs.html#sec-2-10-38

- Move theme name customization in user-init.el as there is a known
  issues related to sml.
- Set the default theme to 'respectful'

Tested-by: Ratheesh S <ratheeshreddy@gmail.com>
Signed-off-by: Ratheesh S <ratheeshreddy@gmail.com>