The build that serves tala.run, talac.tala.run and tazel.tala.run now
also serves the formatter and the linter, chosen by host name like the
others. Each site has a landing page and two documentation pages in
en-US, de-DE, ru-RU and he-IL:

- talafmt: the command line (inputs, --check, --emit, exit status 2 for
  an unreadable line) and what it changes (indentation, line endings,
  trailing whitespace, the final newline; protected text; encodings from
  talafmt.kts).
- talalint: the command line (--fix) and what it checks: the compiler's
  diagnostics as compiler.<code>, and format.trailingWhitespace,
  format.mixedLineEndings and format.missingFinalNewline. --fix rewrites a
  file with talafmt's default layout, which also re-indents blocks.

The facts follow the READMEs of Progmasoft/talafmt and Progmasoft/talalint
0.1.0 and the talalint source. site.ts lists the sites once, with their
names, so the header, the landing page and the documentation shell no
longer keep their own copies. Each host has its robots.txt and
sitemap.xml, nginx gains the two server blocks, and the tests check the
new hosts like the others.

The three documentation pages each drew their own sidebar. The two hand-built
pages listed different topics: Getting started had no link to Syntax. Each page
also opened with a capitalized section kicker.

DocShell now frames every documentation page:

- On the left, the topics of the site, with the current one marked. On a
  narrow screen they fold into a Contents button above the page.
- Above the page, a breadcrumb: site / Documentation / topic.
- The page in a column of at most 720 px.
- On the right, "On this page". It is read from the h2 headings of the
  rendered page, and each heading gets an id from its words in any script.
  It is hidden below 1100 px.
- Under the page, previous and next topic cards and an "Edit this page"
  link to the file the page is written in.

DocPage, OverviewPage and GettingStartedPage use it and drop their own
sidebars and kickers. The styles of the old layout are removed. The labels
are in all four languages.