Dynamic version check on IDE site

The new IDE site currently contains the actual version hardcoded, such that it needs to be updated manually for each release (see both #37 (closed) and !4 (merged)).

While thinking of how the IDE itself can check if a new version is available (see pseuco-ide#31), I was wondering if realizing a similar feature for pseuCo.com is an option. Since the foundation of pseuCo.com is being an offline application, my idea was to create a static page providing a Check for newest release button. Only by clicking it, a request as described in pseuco-ide#31 is sent to the GitLab API, and the most recent version can be extracted from the newest tag name. Similarly, the tag name also appears in the download link, which could therefore also be generated dynamically.

Compared to now, the new site would in some way look similar to this:

Pressing the blue button could ultimately result in:

@fefrei What do you think about it? In my opinion, this approach offers the benefit of being independent from manual changes, with the drawback of somehow violating the philosophy of pseuCo.com. Furthermore, I do not know how complicated the integration of this feature may be, you're the expert to judge on it.