fix: Convert some absolute paths to relative 🌋

[darcywong00]

Follows #691 for #687

Fixes some of the relative paths for upcoming i18n
* Fix relative path to autoload.php

• Start converting absolute paths to relative

Leaving these absolute paths intact for now:

• /keyboards - will need to fix .htaccess
• _test/ pages
• Redirects to SIL pages:
  • /donate
  • /privacy

link-checker will be broken for quite a while as there's a lot of refactoring todo

Test-bot: skip

[keymanapp-test-bot]

User Test Results

Test specification and instructions

User tests are not required

[mcdurdin]

So all the link changes look good to me, but can we use #694 to cleanup all the require_once references?

[mcdurdin]

I think we may be able to reduce the work on require_once changes with #694. Sorry if that doubles up on the edits you've already done...

[darcywong00]

Yep, I'll merge that in to this branch to continue working.

Question: How do I handle links like in the menu?

keyman.com/_includes/2020/templates/Menu.php

Lines 136 to 148 in 947c553

	<?= Menu::render_globe_dropdown("phone"); ?>
	<div class="phone-menu-item">
	<h3>Products</h3>
	<ul>
	<li><a href="/windows/">Keyman <?=$fields->stable_version?> for Windows</a></li>
	<li><a href="/mac/">Keyman <?=$fields->stable_version?> for macOS</a></li>
	<li><a href="/linux/">Keyman <?=$fields->stable_version?> for Linux</a></li>
	<li><a href="/keymanweb/">KeymanWeb.com</a></li>
	<li><a href="/iphone/">Keyman <?=$fields->stable_version?> for iPhone</a></li>
	<li><a href="/ipad/">Keyman <?=$fields->stable_version?> for iPad</a></li>
	<li><a href="/android/">Keyman <?=$fields->stable_version?> for Android</a></li>
	<li><a href="/bookmarklet/">Keyman Bookmarklet</a></li>
	</ul>

Some in the footer too (to /about/...)

[mcdurdin]

I think we'll need to have them aware of the current locale. e.g.

<a href="/<?=$lang?>/windows">

Or something like that. But we should try and avoid doing that except for shared content like this.

[mcdurdin]

we should not be referencing _content anywhere in links. These need the $lang variable embedded

[darcywong00]

Done with fallback to 'en'

[mcdurdin]

here also