feat: replace linguist with go-enry

feistelrequested to merge
feistel/gitlab-elasticsearch-indexer:feat/enry into main

replace custom implementation of linguist with go-enry

note: if the content is binary, no results will be returned: see https://github.com/go-enry/go-enry/blob/7c24e3d5d222dff34a4eb2f2fd7f79dab3d66eb6/common.go#L126-L127 and https://github.com/go-enry/go-enry/blob/7c24e3d5d222dff34a4eb2f2fd7f79dab3d66eb6/common.go#L132-L134

Closes #6 (closed)

Edited by feistel

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