Restructure Eagle

[hacdias]

Current Status: https://pkg.go.dev/github.com/hacdias/[email protected]/eagle

---

What I want to see (WIP):

type Eagle
	func NewEagle(conf *config.Config) (*Eagle, error)

	func (e *Eagle) DeleteEntry(entry *Entry) error
	func (e *Eagle) GetAllEntries() ([]*Entry, error)
	func (e *Eagle) GetEntry(id string) (*Entry, error)
	func (e *Eagle) MakeBundle(entry *Entry) error
	func (e *Eagle) ParseEntry(id, data string) (*Entry, error)
	func (e *Eagle) SaveEntry(entry *Entry) error

	func (e *Eagle) Search(query *SearchQuery) ([]*SearchEntry, error)
	func (e *Eagle) RebuildIndex() error

	func (e *Eagle) HandleWebmentions(webmention *Webmention) error
	func (e *Eagle) SendWebmentions(entry *Entry) error

	func (e *Eagle) Build(clean bool) error
	func (e *Eagle) ShouldBuild() (bool, error) // maybe make this verification on NewEagle and hide this

	Twitter     *Twitter
	Miniflux    *Miniflux

Notifications: mostly used in Server. Can move completely to Server.

type Notifications interface {
	Notify(msg string)
	NotifyError(err error)
}

Some of this things would probably come organically if tried to implement #16 #23 #24