The pages were renamed; the rest of the repository still said Visual X#:
- the site API answered with the name Visual X#, and its test expected it;
- the documents, the issue and pull request templates, the support address
  and the name of the code scanning configuration.

The documents also said that a left-to-right mark follows the name of the
language in Hebrew text. That was for the `#` of the old name; the sentence
now speaks of names that end in a symbol, such as C#.

Not changed: host names, paths and unit names on the server, the name of the
backend artifact, the Kotlin package of the backend, and the keys of the
browser storage.

Call the language Tala in the text of the site

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