3c806913 *docs: improve external scanner details and fix conflicting tokens details*

[Sec-p101]

3c806913 docs: improve external scanner details and fix conflicting tokens details

• Removed convention notes introduced in Installer 2.19.2 does not offer experimental options #1947 due to:
  • It doesn't so strict for bindings and they may need to obey to some target language conventions.
  • For language grammars there is a note that states the same in the Creating Parsers section.
• Removed External Scanning item introduced in 87a0517 commit originated from git #1612 due to unclear consistency with other 5 original statements. There is a similar explanation in the Other External Scanner Details section.

613382c7 docs: update badges; fix markdown lint complains

Linter config .vscode/settings.json:

{
    "[markdown]": {
        "files.trimTrailingWhitespace": false,
    },
    "markdownlint.config": {
        "default": true,
        // "ul-style": {
        //     "style": "asterisk"
        // },
        "MD001": false,
        "MD024": false,
        "MD025": false,
        "MD033": false,
        "MD041": false,
        "MD053": false,
    },
}

Fixes: #2210

Originally posted by @ahlinc in tree-sitter/tree-sitter#2211

[dscho]

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