Add Astro language

## Language name
**Astro**

## URL of example repository
https://github.com/snowpackjs/astro

## URL of syntax highlighting grammar
[My grammar](https://github.com/Nixinova/Astro-vscode/blob/main/grammars/astro.tmLanguage.yaml)  ([preview](https://github-lightshow.herokuapp.com/?utf8=y&scope=from-url&grammar_url=https://github.com/Nixinova/Astro-vscode/blob/main/grammars/astro.tmLanguage.yaml&code_source=from-url&code_url=https://github.com/Nixinova/NovaGrammars/blob/main/samples/index.astro))

## Most popular extensions
[.astro](https://github.com/search?q=extension%3Aastro&type=code) - 1006 repos - using Harvester I got through 467 files before being rate limited and had 101 unique repos, so extrapolating that there should be over 200 unique out of that 1K.

## Detected language
None

Provide feedback

Saved searches

Use saved searches to filter your results more quickly

Add Astro language #5459

Language name

URL of example repository

URL of syntax highlighting grammar

Most popular extensions

Detected language

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development