Improve link buttons and inline link buttons styling (#8238)

* Set padding: 0 to both "link" and "link_inline"

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Remove redundant settings - _SpotlightDialog.scss

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Remove redundant settings - JoinRuleSettings

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Remove redundant settings - _ViewSourceEvent.scss

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Remove redundant settings - _RoomDirectory.scss

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Remove redundant settings - _InviteDialog.scss

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Remove redundant settings - ServerOfflineDialog

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Remove redundant settings - UpdateCheckButton

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Remove redundant settings - NonUrgentEchoFailureToast

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Remove redundant settings - CallView

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Remove unused styles - _RoomSettingsDialogBridges.scss

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Replace "link" with "link_inline" for inline links

- src/components/structures/UserMenu.tsx
- src/components/views/dialogs/BetaFeedbackDialog.tsx
- src/components/views/dialogs/FeedbackDialog.tsx
- src/components/views/rooms/NewRoomIntro.tsx
- src/components/views/settings/tabs/room/NotificationSettingsTab.tsx
- src/components/views/settings/tabs/user/PreferencesUserSettingsTab.tsx
- src/components/views/spaces/SpaceCreateMenu.tsx

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Replace "link_inline" with "link" for links not inline

- src/async-components/views/dialogs/security/CreateKeyBackupDialog.tsx
- src/async-components/views/dialogs/security/CreateSecretStorageDialog.tsx
- src/components/structures/auth/ForgotPassword.tsx
- src/components/structures/auth/Registration.tsx
- src/components/views/auth/InteractiveAuthEntryComponents.tsx
- src/components/views/dialogs/security/AccessSecretStorageDialog.tsx
- src/components/views/dialogs/security/RestoreKeyBackupDialog.tsx
- src/components/views/messages/TileErrorBoundary.tsx
- src/components/views/messages/ViewSourceEvent.tsx

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Remove a redundant declaration - _SetupEncryptionBody.scss

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Remove a redundant declaration - _ReplyChain.scss

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Remove a redundant declaration - _EventTile.scss

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Remove an obsolete style block - _RoomPreviewCard.scss

The block was transferred from _SpaceRoomView.scss with ec24dc661e

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Remove a redundant declaration - _SecurityUserSettingsTab.scss

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Remove element='span' - NewRoomIntro.tsx

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Remove redundant declarations - _ServerPicker.scss

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Replace 'link' with 'link_inline' - AnalyticsToast.tsx

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

src/components/views/auth/InteractiveAuthEntryComponents.tsx

@@ -865,7 +865,7 @@ export class FallbackAuthEntry extends React.Component<IAuthEntryProps> {
         }
         return (
             <div>
-                <AccessibleButton kind='link_inline' inputRef={this.fallbackButton} onClick={this.onShowFallbackClick}>{
+                <AccessibleButton kind='link' inputRef={this.fallbackButton} onClick={this.onShowFallbackClick}>{
                     _t("Start authentication")
                 }</AccessibleButton>
                 { errorSection }