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/async-components/views/dialogs/security/CreateKeyBackupDialog.tsx

@@ -305,11 +305,9 @@ export default class CreateKeyBackupDialog extends React.PureComponent<IProps, I
         if (matchText) {
             passPhraseMatch = <div className="mx_CreateKeyBackupDialog_passPhraseMatch">
                 <div>{ matchText }</div>
-                <div>
-                    <AccessibleButton element="span" className="mx_linkButton" onClick={this.onSetAgainClick}>
-                        { changeText }
-                    </AccessibleButton>
-                </div>
+                <AccessibleButton kind="link" onClick={this.onSetAgainClick}>
+                    { changeText }
+                </AccessibleButton>
             </div>;
         }
         return <form onSubmit={this.onPassPhraseConfirmNextClick}>