new release

* nested components supported
* syntax change
* empty Lua lines (`%`) now permitted, can use to format code
* docs: fix cross-referencing links bug
* docs: update to reflect new syntax
* docs: remove concept of directives, now there are components and Lua
  code blocks
* add LICENSE file
* add README.md file
* api: htt.Component.is -- check if value is a component
* api: all components now have a .name attribute containing the name
  they were defined with

Defining components, before:
```
% @component foo
...
% @EnD
```

Defining components, now:
```
% <foo>
...
% </foo>
```

Lua code blocks, before:
```
% @code
...
% @EnD
```

Lua code blocks, now:
```
%%%
...
%%%
```

Merge pull request #2 from jwdevantier/api-docs-2

Merge pull request #1 from jwdevantier/api-docs-1

Fixes, LuaCATS documentation

gh workflow amend

stx highlighting, gh actions

Copied syntax highlighting definition from
https://github.com/jwdevantier/htt-vscode

I do this because I hate submodules. There, I said it.