[A11y] Broken skip link with flexible layout templates

[herbdool]

Description of the bug

Flexible layout templates need the Page Title block to be added manually. However, the Page Title block won't include a #main-content anchor for the "skip link". I've noticed when being warned by https://wave.webaim.org/ that the skip link is broken on a home page using a flexible layout template.

Steps To Reproduce

To reproduce the behavior:

1. Create a flexible layout template.
2. Apply it to Default Layout.
3. Add a Page Title block.

Actual behavior

There's no <a id="main-content"></a> included with the Page Title block.

Expected behavior

Either the flexible layout template should automatically include the anchor or it should be included with the Page Title block.

[aliya-rahmani]

@herbdool Can I work on this issue?

[herbdool]

@aliya-rahmani sure!