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 ec24dc661edb6979ba901936067e5bc731dafa59

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/structures/UserMenu.tsx

@@ -276,14 +276,14 @@ export default class UserMenu extends React.Component<IProps, IState> {
                 <div className="mx_UserMenu_contextMenu_header mx_UserMenu_contextMenu_guestPrompts">
                     { _t("Got an account? <a>Sign in</a>", {}, {
                         a: sub => (
-                            <AccessibleButton kind="link" onClick={this.onSignInClick}>
+                            <AccessibleButton kind="link_inline" onClick={this.onSignInClick}>
                                 { sub }
                             </AccessibleButton>
                         ),
                     }) }
                     { _t("New here? <a>Create an account</a>", {}, {
                         a: sub => (
-                            <AccessibleButton kind="link" onClick={this.onRegisterClick}>
+                            <AccessibleButton kind="link_inline" onClick={this.onRegisterClick}>
                                 { sub }
                             </AccessibleButton>
                         ),