- Correct the name to the apk to match the one generated.
- Fix typo on click on, and match the format on the rest of the
instructions instead.

The building from source instructions were written around the time
Android Studio (AS) was version 1.5. Since then, some prompts/options have
been removed or moved around. Thus, users willing to build from source
may get confused with the current instructions. Update the screenshots
to show a more version of AS (3.5), and remove the steps that are not
longer necessary.

* Rename shortcode hidingemail.html to contact.html
* Change content/ pages to new contact shortcodes

* Add html lang tag
* Error: A charset attribute on a meta element found after the first 1024 bytes.
* Error: An img element must have an alt attribute, except under certain conditions.
* Error: Stray end tag input.
* Warning: The language attribute on the script element is obsolete. You can safely omit it.
* Error: An img element must have an alt attribute, except under certain conditions.
* Error: duplicate menu ids
* Baseof: Remove duplicate ids
* Warning: The border attribute is obsolete. Consider specifying img { border: 0; } in CSS instead.
* The border attribute is obsolete. Consider specifying img { border: 0; } in CSS instead.
* Error: Element f12 not allowed as child of element p in this context.
* Error: An img element must have an alt attribute, except under certain conditions.
* Stray end tag input.
* The language attribute on the script element is obsolete. You can safely omit it.
* Unclosed element div.