feat: support modifying head element textContent property

[sachamasry]

This adds a simple function push_content, making a call to update the textContent property and not an attribute.

On the client side, the index.ts function, applyToElement adds a new check, for an attribute of 't', setting the textContent to the new value, or appending to it.

[BartOtten]

@sachamasry thanks for the contribution :)

Any chance you committed under the wrong Git user? If so, let me know and I'll fix the contribution link.

[sachamasry]

Thank you Bart for the update, and your continuing hard work! I've just updated and am very happy it works; I just hope other people find it useful.

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