The logo already said Tala while the header, the titles, the pages and the
forum notice still said Visual X#. The text now names the language Tala in
the four languages of the site, in the page metadata and in the forum notice.

With the name go the things that changed with it: source files end in .tala,
the project file is BUILD.kts, the compiler is talac, and the links lead to
Progmasoft/tala. A native executable still ends in .vxse, so that stays.

The forum page refers to its stylesheet and script with a new version value,
because the script changed and a cache in front of the host keeps the old
file for hours.

Not changed: the host names, the file name of the mark, and the keys under
which the browser keeps the chosen language and theme, so that a visitor
does not lose them.

Show the Tala logo and announce the coming change of domain

Two lines of the new test were longer than the 100 columns Prettier allows,
and the formatting check of the frontend failed. The title of the test is
shorter and the pattern that looks for the host check no longer spells out
the whole expression.

The language is now Tala. The home page and the social image use the new
logo; the mascot is the same drawing, and the test that compares the mark
with the leopard of the full logo still holds. The logo of the site is the
supplied drawing without its opaque background.

On xsharp-lang.xyz and its subdomains a line above the header says that the
site moves to a new domain within a month and that xsharp-lang.xyz keeps
working and will redirect. The line is written in each of the four languages
of the site and follows the language switch; it is not shown on any other
host, so a preview or the new domain does not carry it.

The rest of the text of the site still says Visual X#; that follows with the
new domain.

Add workflow analysis and hand version updates to Renovate

The pull request that hands version updates to Renovate is folded in
here, so that the two workflow changes are tested and merged once.

main gained the source-map-js update, without which the frontend job
fails its npm audit on every branch.

Update source-map-js past GHSA-68fv-2mgg-jv7q

Renovate proposes the version updates of this repository from now on.
It watches what Dependabot watched, looks once a week, takes a release
a week after it is published, opens one pull request for each kind of
dependency with at most two open, and rebases a pull request only when
it conflicts. A dashboard issue lists what is pending.

The Dependabot configuration is removed, which turns its version
updates off. Dependabot keeps its alerts and its security updates,
which are repository settings. Renovate does not open its own pull
requests for vulnerabilities, so one advisory does not get two fixes.

The configuration passes Renovate's validator and takes effect when
the Renovate app is installed on the repository.

ci.yml already has a dependency-review job, which I missed. The
workflow this branch added ran the same review a second time on every
pull request, so it is removed; the existing job stays as it is.